Explanation:

- Anil Prakash Joshi received the Padma Bhushan Award in 2020 for his contributions.

- He is renowned for his efforts in rural development, especially eco-friendly and sustainable methods.

- His work largely revolves around improving rural livelihoods through environmental conservation.

- Option 1: Social Work

Correct. Anil Prakash Joshi's recognition is in social work, emphasizing rural development and ecological initiatives.

- Option 2: Arts

Seems irrelevant since his focus is not artistic.

- Option 3: Public Affairs

Doesn't fit his specific contributions toward rural and environmental work.

- Option 4: Medicine

Not applicable, as he isn't recognized for medical efforts.