The correct answer is C. V. V. Giri.
V. V. Giri was an Indian trade unionist, politician, and the third President of India. He was closely associated with industrial relations in India and served as the President of the Indian National Trade Union Congress (INTUC) from 1957 to 1970. He was also the Chairman of the National Labour Commission from 1967 to 1969.
A. B. Kurien was an Indian agricultural scientist and the founder of the Amul Dairy Cooperative. He was not closely associated with industrial relations.
B. Gadgil was an Indian economist and politician. He was a member of the Constituent Assembly of India and served as the Minister of Planning and Development from 1952 to 1956. He was not closely associated with industrial relations.
D. Vinoba Bhave was an Indian social reformer and Gandhian activist. He was the founder of the Bhoodan movement, which aimed to redistribute land to the landless. He was not closely associated with industrial relations.