The correct answer is: B. President
The President of India has the power to declare emergency under Article 352 of the Indian Constitution. The President can declare emergency if he is satisfied that a grave emergency exists whereby the security of India or any part of the territory thereof is threatened, whether by war or external aggression or armed rebellion.
The President can also declare emergency if he is satisfied that the financial stability or economic security of India or any part of the territory thereof is threatened.
The President can declare emergency only after obtaining the
written consent of the Union Cabinet.The President can also revoke an emergency at any time.
The Prime Minister is the head of the Union Government and is responsible to the Parliament. The Chief Justice is the head of the Supreme Court of India. Parliament is the supreme legislative body of India.
The President has the power to declare emergency because he is the head of the State and is responsible for the security and well-being of the country.