The correct option is A Mrs. Indira Gandhi
In 1971 Lok Sabha election, Raj Narain an SSP candidate stood against Indira Gandhi and was defeated, he filed a petition accusing Indira Gandhi of electoral malpractices. The Allahabad High court in 1975 upheld the accusation and disqualified Indira Gandhi from Contesting elections for next 6 years. This led to the imposition of emergency in 1975 by Indira Gandhi.