The correct answer is (a) Ch. Charan Singh.
Ch. Charan Singh was an Indian politician who served as the Prime Minister of India from 1979 to 1980. He was a member of the Bharatiya Lok Dal party and was known for his views on rural development and agrarian reform.
The book “Indian Economy: A Gandhian Blue Print” was published in 1978. It is a collection of essays by Ch. Charan Singh on the Indian economy and its development. In the book, Singh argues that the Indian economy should be based on Gandhian principles of self-reliance and village development.
The other options are incorrect.
(b) Shri Jai Prakash Narain was an Indian politician who was a leading figure in the Indian independence movement. He was a member of the Indian National Congress party and was known for his views on socialism and secularism.
(c) Dr. Manmohan Singh was an Indian economist and politician who served as the Prime Minister of India from 2004 to 2014. He was a member of the Indian National Congress party and was known for his views on economic liberalization.
(d) Acharya Vinoba Bhave was an Indian social reformer and spiritual leader. He was a follower of Mahatma Gandhi and was known for his work on land reform and rural development.