The green revolution .a. began in the mid-nineteenth century. b. discouraged the mechanization of agriculture. c. decreased the energy subsidy of most food. d. encouraged the use of monocropping. e. pertained to leafy green plants only.

d. encouraged the use of monocropping

Explanation:

The onset of the green revolution was seen as the role of the hybridization if the planets and the increase of the monocropping system and special importance is given the variety of the rice and the wheat that began in the 19th century. And led to further globalization and modern technological advances.

The answer is price.