Correct Option: A

When President Zakir Hussain died in office, the Vice President VV Giri, acted as the President. Later, Mr. Giri resigned as the Vice President. The CJI, Justice Hidayatullah then became the acting President of India. The senior-most judge of the Supreme Court became the acting Chief Justice of India. When the newly elected President took office a month later, justice Hidayatullah reverted as the Chief Justice of India.