The green revolution refers to advances that took place in education. agriculture. space exploration. medicine.

The answer to the question given above would be the word 'agriculture'. The Green Revolution refers to the advances that took place in agriculture. This is the answer because all the other choices do not fit the description of Green Revolution.

The green revolution refers to the advances that have taken place in agriculture. More specifically, the green revolution refers to the increased popularity of ecological food which increases sustainability and saves the planet by a little piece each time. 

The Great Plains are the most fertile agricultural areas so I would say west.