The Term "Green Revolution" Refers to the Increased Use of __________

The term "Green Revolution" refers to the increased use of __________ to increase food production in Third World countries.

A) traditional, organic farming methods that avoid the use of pesticides
B) intensive human labor for planting, weeding, and harvesting
C) renewable tree- and root-crop products of the tropical rainforests
D) mechanized agriculture, genetic engineering, and artificial hybrid crops