Explanation:

- Option 1: Ranjit Singh

- Not relevant. Ranjit Singh was the founder of the Sikh Empire in Punjab, but he wasn't made regent by the Treaty of Lahore. He passed away in 1839.

- Option 2: Chattar Singh Attariwala

- Incorrect. He was a prominent Sikh leader but did not play a role as a regent under the Treaty of Lahore.

- Option 3: Rani Jindan

- She was the queen regent for her young son, Duleep Singh, during a tumultuous period in Punjab's history around the time of the Treaty of Lahore in 1846.

- Option 4: Badan Singh

- Not correct here. He was associated with the princely states in Rajasthan, not with Punjab.

Correct Answer: Option 3 - Rani Jindan