The correct answer is option 'B' - Sectional Interest group.

Explanation:
Interest groups are organizations formed by individuals with common interests, goals, or concerns, who seek to influence public policy. These groups play a significant role in shaping government policies and decisions as they represent the collective voice of specific sections of society. They can be categorized into different types based on their nature and objectives.

Types of Interest Groups:
1. Public Interest Groups: These groups advocate for policies and issues that benefit the general public or society as a whole. They focus on issues such as environmental protection, human rights, consumer rights, etc. Public interest groups work towards the betterment of the entire society rather than representing a specific section.

2. Sectional Interest Groups: These groups represent the interests of specific sections or segments of society. They aim to protect and promote the interests of their members or constituents. Sectional interest groups are further categorized into trade unions, business associations, professional bodies, etc.

Characteristics of Sectional Interest Groups:
- Trade Unions: Trade unions are formed by workers or employees in a particular industry or occupation. They work to safeguard the rights and interests of workers, negotiate better wages and working conditions, and provide support and representation during labor disputes.

- Business Associations: Business associations are formed by entrepreneurs, business owners, or industry professionals. They work towards promoting the interests of businesses, advocating for favorable business policies, and providing a platform for networking and collaboration among members.

- Professional Bodies: Professional bodies are organizations that represent professionals in specific fields such as medicine, law, engineering, etc. They work towards maintaining professional standards, regulating professional conduct, and advocating for the interests and welfare of their members.

Why Sectional Interest Groups:
Sectional interest groups are referred to as such because they represent the interests of specific sections of society. Unlike public interest groups that work for the benefit of society as a whole, sectional interest groups focus on the concerns and demands of their respective sections. They aim to protect and promote their members' interests, whether it is workers' rights, business growth, or professional development.

Conclusion:
Interest groups like trade unions, business associations, and professional bodies fall under the category of sectional interest groups. These groups play a crucial role in representing the interests of specific sections of society and influencing public policy decisions that directly affect their members.

Interest Groups
Interest groups are organizations that seek to influence public policy and promote the interests of a particular group of people or industry. They play an important role in democratic societies by representing the concerns and demands of their members to policymakers.
Types of Interest Groups
There are various types of interest groups, including:
1. Public Interest Groups:
- Public interest groups advocate for policies and issues that benefit the general public or society as a whole.
- Their focus is on promoting the common good and addressing issues such as environmental protection, human rights, and consumer rights.
2. Sectional Interest Groups:
- Sectional interest groups represent the specific interests of a particular section or group of society.
- They aim to protect and advance the interests of their members, such as trade unions representing workers, business associations representing businesses, and professional bodies representing professionals in a specific field.
3. Movement Groups:
- Movement groups are often associated with social or political movements and advocate for broader social or political change.
- They may focus on issues like civil rights, gender equality, or environmental justice.
4. Pressure Groups:
- Pressure groups are interest groups that actively seek to influence policymakers and public opinion to achieve their goals.
- They use various tactics, such as lobbying, public demonstrations, and media campaigns, to pressure decision-makers.
The Correct Answer
The correct answer to the given question is:
B: Sectional Interest Group
Trade unions, business associations, and professional bodies are examples of sectional interest groups as they represent the specific interests of a particular section or group in society.