The correct option is D Nationalisation of private banks
The Congress won the 1971 General elections with a record margin, and Indira Gandhi adopted a series of social and economic policies that transformed the system. This included nationalisation of private banks and abolition of privy purse, a payment made to the erstwhile rulers of princely states.
The Indira Gandhi led government declared Emergency on 25 June, 1975. The 42nd Constitutional Amendment passed during this period weakened the democratic ethos of the country.