The correct answer is (c) Supreme Court.
The Supreme Court is the highest court in India and has the power to interpret the Constitution. It can strike down laws that it deems to be unconstitutional. The Supreme Court also has the power to review the decisions of lower courts.
The President is the head of state of India and has the power to appoint judges to the Supreme Court. However, the President can only appoint judges who are recommended by the Chief Justice of India.
The Lok Sabha is the lower house of the Indian Parliament. It has the power to pass laws, but it cannot amend the Constitution.
The Cabinet is the executive body of the Indian government. It is headed by the Prime Minister and is responsible for implementing the laws passed by Parliament.
The Supreme Court is the only institution that has the power to interpret the Constitution and strike down laws that it deems to be unconstitutional. This makes it the guardian of the Indian Constitution.