For the first time the objective of self-reliance was incorporated in the _________ Five-Year Plan.

Correct option is A

The objective of self-reliance was incorporated in the Third Five-Year Plan. So, the answer is (a).
The Third Five-Year Plan was implemented from 1961 to 1966. It was the first plan to emphasize self-reliance as a national goal. The plan focused on increasing agricultural production, expanding industrial capacity, and developing infrastructure.
The Third Five Year Plan (1961-1966) of the Economic Development of India is also popularly called “Gadgil Yojna”.