Who promulgated an emergency in India?

Correct option is A

Indira Gandhi, then Prime Minister of India, declared the Emergency in India on 25
June 1975. This period, known as "The Emergency," lasted until 21 March 1977. During this time, civil liberties were suspended, the press was censored, and many political opponents were arrested.
Rajiv Gandhi was Prime Minister later but did not declare any Emergency.
H.D. Deve Gowda (often spelled as Deve Gowda) was Prime Minister in the 1990s but did not impose any Emergency.
V.P. Singh was also a Prime Minister after Indira Gandhi, without any Emergency being declared during his tenure.