Explanation:

- Option 1: Andre Beteille - He is a noted Indian sociologist but is not specifically associated with the study of social movements among the Yadava in North India.

- Option 2: Shah - This option is too vague as several scholars might fit this name. It doesn't specifically point to any work related to the Yadava social movements.

- Option 3: G. Omvedt - Gail Omvedt was a scholar known for her work on social movements and Dalit and feminist issues in India. However, she didn’t particularly focus on the Yadava community in North India.

- Option 4: M S A Rao - He is indeed known for his work on social movements, specifically among castes in India, including the Yadava community in North India.

The correct answer is:

- Option 4: M S A Rao

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