Correct option is C
Let's address each statement regarding the planned development model of India
(a) True. The model of planned development in India was indeed inspired by the Soviet model of development, which emphasized central planning.
(b) True. The draft document of the First Five-Year Plan was indeed released in the year 1951, and the plan itself was implemented from 1951 to 1956.
(c) False. P.C. Mahalanobis was not the architect of the First Five-Year Plan. He played a significant role in the formulation of the Second Five-Year Plan, which was launched in 1956 and focused on industrialization. The First Five-Year Plan was more focused on the agricultural sector.
Given the statements, the one which is not correct is:(c) P.C. Mahalanobis was the architect of the First Five-Year Plan. So the answer is (c).