Explanation:

- Option 1: Pawan Kumar is a noted Indian wrestler, but he hasn't achieved World No. 1 ranking in the 65-kg freestyle category as of March 2021.

- Option 2: Yogeshwar Dutt is an Olympic bronze medalist known for his achievements in wrestling. However, he did not secure the World No. 1 position in the 65-kg freestyle wrestling category in March 2021.

- Option 3: Sushil Kumar is another highly celebrated Indian wrestler. He is a two-time Olympic medalist but hasn't reached World No. 1 in the 65-kg category in March 2021.

- Option 4: Bajrang Punia ?? is indeed the correct answer. He became World No. 1 in the 65-kg freestyle wrestling category in March 2021 due to his continuous remarkable performances on the international stage.