Explanation:

Alright, let’s break this down:

- Option 1: Stand Up India

- This scheme actually supports entrepreneurship among SC, ST, and women, helping them get bank loans for business. No connection to greywater or water management.

- Option 2: Donate-a-Pension

- This is about encouraging citizens to contribute to someone else’s pension through the PM-SYM Yojana. Again, not water-related.

- Option 3: Sujalam 2.0

- Here’s the thing: Gajendra Singh Shekhawat did launch the Sujalam 2.0 campaign in March 2022. The focus is squarely on greywater management at the village level—using community-based approaches to manage and reuse water.

- Option 4: SAMARTH

- This is about skill development, especially in textiles. Doesn’t touch water or sanitation issues.

So, the correct answer is definitely option 3, Sujalam 2.0 for greywater management.