The correct answer is (a) Jawaharlal Nehru.
Jawaharlal Nehru was the first Prime Minister of India and the leader of the Indian National Congress. He was a staunch advocate of secularism and democracy, and he played a key role in the drafting of the Indian Constitution. Nehru was also a strong supporter of economic development, and he adopted a policy of mixed economy in order to achieve this goal.
A mixed economy is an economic system in which both the private sector and the public sector play a role in the economy. In a mixed economy, the government owns and operates some businesses, while other businesses are owned and operated by private individuals or companies. The government also regulates the economy in order to promote economic growth and stability.
Nehru’s policy of mixed economy was successful in achieving the goal of economic development. India’s economy grew rapidly under Nehru’s leadership, and the country became a major player in the global economy. Nehru’s policy of mixed economy also helped to promote social justice and equality in India.
The other options are incorrect because they were not Prime Ministers of India. Rajendra Prasad was the first President of India, S. Radhakrishnan was the second President of India, and Lord Mountbatten was the last Viceroy of India.