The General Assembly of the United Nations (UN) is the main deliberative organ of the organization. It is an important forum where representatives from all member states come together to discuss and make decisions on a wide range of global issues. Here is a detailed explanation of why the correct answer is option 'B':

1. Role and Function:
The General Assembly serves as a platform for member states to express their views and concerns on various international issues. It provides a forum for discussion, negotiation, and decision-making on matters such as peace and security, development, human rights, and international law.

2. Composition:
The General Assembly consists of all 193 member states of the United Nations. Each member state has one vote, ensuring equality among nations regardless of their size or power. This inclusivity allows for a diversity of perspectives to be represented and heard.

3. Deliberative Function:
As the main deliberative organ of the UN, the General Assembly discusses and debates a wide range of issues through its plenary meetings and specialized committees. Member states present their positions, negotiate resolutions, and work towards consensus or majority decisions.

4. Decision-Making:
The General Assembly has the authority to make recommendations on international issues, with decisions being reached through voting. While its resolutions are not legally binding, they carry significant political weight and can shape global norms and policies.

5. Other Functions:
In addition to its deliberative role, the General Assembly also performs various other functions. These include electing non-permanent members of the Security Council, appointing the Secretary-General, approving the UN budget, and overseeing the work of other UN organs and agencies.

In conclusion, the General Assembly of the United Nations is the main deliberative organ of the organization. It plays a crucial role in facilitating discussions, decision-making, and consensus-building among member states. By providing a platform for global dialogue, the General Assembly contributes to the promotion of peace, development, and cooperation among nations.