Explanation
In India, the source of political authority is A: People of India.
The Constitution of India begins with the words "We, the people of India..." which clearly establishes the fact that in India, sovereignty resides in the people. The Constitution of India provides for a democratic form of government where the people of India are the ultimate source of political authority.
The Constitution of India provides for a representative democracy where citizens exercise their political power indirectly through their elected representatives. The Constitution of India outlines the structure of government and defines the powers and responsibilities of the different branches of government - the legislature, executive, and judiciary. The Constitution also lays down the fundamental rights and duties of the citizens of India.
In a democratic system, the government derives its power and legitimacy from the consent of the governed, and the people have the right to participate in the decision-making process. Therefore, the people of India are the source of political authority in India.