The interim government formed in 1946 was a transitional phase in Indian history during which India was preparing for its independence from British colonial rule. Option 1, Jawaharlal Nehru, is the correct answer because he served as the Vice-President of the Executive Council in this interim government.

Option 2, Dr. S. Radhakrishnan, was a distinguished philosopher and statesman, and served as the first Vice President and second President of independent India, but he was not the Vice-President of the Executive Council in the interim government.

Option 3, C. Rajagopalachari, was a lawyer, independence activist, politician, writer, and statesman who served as the last Governor-General of India, however, he was not involved in the interim government as the Vice-President.

Option 4, Dr. Rajendra Prasad, was a very influential leader, who later became the first President of independent India, but in the interim government, he was not the Vice-President but the Minister of Food and Agriculture.