In England's Agricultural Revolution, what did the four-field rotation system involve? (2 points)
A. growing potatoes in every fourth field
B. rotating wheat, barley or rye, clover, and turnips in the fields each year
C. • using fertilizer on fields
D. • leaving one-fourth of the land fallow every year
B. rotating wheat, barley or rye, clover, and turnips in the fields each year
D. leaving one-fourth of the land fallow every year