The correct answer is (d) Bharat Ratna.
The Bharat Ratna is the highest civilian award in India. It is awarded by the President of India to citizens of India in recognition of exceptional service to the nation. The award was instituted in 1954.
The Padma Vibhushan is the second-highest civilian award in India. It is awarded by the President of India to citizens of India in recognition of distinguished service of a high order to the nation. The award was instituted in 1954.
The Padma Bhushan is the third-highest civilian award in India. It is awarded by the President of India to citizens of India in recognition of distinguished service of a high order to the nation. The award was instituted in 1954.
The Padma Shri is the fourth-highest civilian award in India. It is awarded by the President of India to citizens of India in recognition of distinguished service in any field. The award was instituted in 1954.