The correct option is
C green revolution
"Green revolution:
Green revolution refers to the initial step taken by the government during the 1960s to increase the crop production by introducing high yielding plants; high amount of fertilizers and pesticides; and modern irrigation methods.
Different types of framing:
The following are the different types of farming employed in crop cultivation:
Extensive farming: It is a type of farming in which huge amount of land is used for cultivation.
Intensive farming: It is the type of farming in which high manpower, capital, and the large area of land is used for cultivation.
Mixed farming: It is a type of farming in which along with crop cultivation, animal such as cattle, hen, goat, etc., are reared.
Multiple cropping: It is a type of farming in which one or more crop is grown in one season in one land."