The correct answer is (d) Lok Sabha.
The Council of Ministers is collectively responsible to the Lok Sabha, the lower house of the Parliament of India. This means that the Council of Ministers must have the confidence of the Lok Sabha in order to remain in office. If the Lok Sabha passes a no-confidence motion against the Council of Ministers, the Council of Ministers must resign.
The Prime Minister is the head of the Council of Ministers and is responsible for appointing the other members of the Council. The Prime Minister is also the leader of the party or coalition of parties that has the most seats in the Lok Sabha.
The President is the head of state of India and is elected by an electoral college consisting of members of both houses of Parliament and the legislative assemblies of the states. The President has the power to appoint the Prime Minister and other members of the Council of Ministers, but the President must act on the advice of the Prime Minister.
The Rajya Sabha is the upper house of the Parliament of India. The members of the Rajya Sabha are elected by the members of the legislative assemblies of the states and the Union Territories. The Rajya Sabha has a limited role in the legislative process and cannot pass a no-confidence motion against the Council of Ministers.