What Does the "Green Revolution" Refer To

What does the "green revolution" refer to?

A) The increased use of recycled and recyclable goods by people in developed countries
B) The dramatic gains in agricultural yields in many developing countries, caused by increased use of fertilizers, pesticides, and new crop breeds
C) The move of people away from classical medicine, including vaccines, to use of homeopathic remedies
D) The dramatic increase in the use of solar and wind power to make electricity since the 2000s