Explanation:

- Option 1: Hocart and Senart

- Hocart and Senart contributed to the discussion on Indian society and caste but are not directly linked to the occupational theory.

- Option 2: Ghurye

- Ghurye focused on the cultural and racial aspects of the caste system, analyzing its socio-historical context.

- Option 3: Nesfield

- Nesfield is indeed the one who proposed the occupational theory of the caste system. He argued that caste originated from the division of labor based on occupations.

- Option 4: M. N. Srinivas

- M. N. Srinivas is known for his work on the concept of "Sanskritization" in the caste system but not specifically for the occupational theory.