The most advantaged group of people is option 'A' which includes rich businessmen. Here's why:

1. Economic Power: Rich businessmen have the economic power to influence political decisions and shape policies that benefit them. They have access to resources that allow them to create and control markets, which further consolidates their power.

2. Social Capital: They also have access to social networks and connections that allow them to further their interests. They can use their social capital to gain access to political power and influence decision-making.

3. Education: Rich businessmen often have access to the best education and training, which gives them a competitive advantage in the workforce. This allows them to create and control businesses that generate wealth and further consolidate their power.

4. Legal Power: They also have access to legal power, such as lawyers and lobbyists, which they can use to shape laws and regulations in their favor.

5. Media Power: Rich businessmen often have control over media outlets, which allows them to shape public opinion and further consolidate their power.

In contrast, other groups like scheduled castes, scheduled tribes, and Muslims face various forms of discrimination and marginalization. They often lack access to resources, education, and political power, which limits their ability to advance economically and socially.