Between 1950 and 2011 the Productivity of Wheat Farmers in the United

Multiple Choice

Between 1950 and 2011 the productivity of wheat farmers in the United States more than doubled.This means that

A) the amount of land and other resources devoted to wheat production more than doubled.
B) the incomes of wheat farmers more than doubled.
C) the total amount of wheat produced more than doubled.
D) the amount of wheat produced by the average farmer more than doubled.