The correct answer is option 4, The Prime Minister of India.

The National Integration Council is a governmental body in India that is responsible for promoting and maintaining national integration and communal harmony in the country. It was formed in 1961 and is chaired by the Prime Minister of India.

Option 1, The President of India, is the ceremonial head of state in India and does not hold the position of Chairman of the National Integration Council.

Option 2, The Vice-President of India, is the second-highest constitutional office in the country but does not hold the position of Chairman of the National Integration Council.

Option 3, The Chief Justice of India, is the highest-ranking judicial officer in the country but does not hold the position of Chairman of the National Integration Council.

Hence, the correct answer is option 4, The Prime Minister of India.