Explanation:

- Option 1: Prime Minister

- The Chief Minister is not directly responsible to the Prime Minister. The Chief Minister is the head of a state's government, while the Prime Minister is the head of the central government.

- Option 2: Rajya Sabha

- The Rajya Sabha is the upper house of India's Parliament and holds no direct authority over a state's Chief Minister.

- Option 3: Legislative Assembly

- The Chief Minister is directly responsible to the Legislative Assembly of the state. They must maintain its confidence to stay in office.

- Correct Answer

- Option 4: Governor

- The Chief Minister is appointed by the Governor but is not directly responsible to them in terms of daily governance.