Explanation:

The correct answer is option 'A', i.e., "The President of India".

Explanation:

The President of India is the constitutional head of the Indian state. Some of the reasons why the President is considered the first citizen of India are:

Constitutional Powers: The President of India has several constitutional powers, including the power to appoint the Prime Minister, Chief Justice of India, Governors of States, and other high officials. The President is also the Commander-in-Chief of the armed forces.

Protocol: The President of India is accorded the highest protocol precedence in the country. This means that the President is given the highest level of respect and honour among all the citizens of India.

Symbolic Role: The President of India also plays a symbolic role in the country. The President represents the unity of the country and is a symbol of the country's sovereignty.

International Relations: The President of India acts as the head of state in the international arena. The President represents India in international events and visits other countries on behalf of the Indian government.

Conclusion:

In conclusion, the President of India is considered the first citizen of India due to his/her constitutional powers, protocol, symbolic role, and international relations.