The Following Question Are Based on the Following Graph

Multiple Choice

The following question are based on the following graph. The curves D and S represent the market demand and supply curves for farm products in 1960. The curves D₁ and S₁ represent the market demand and supply curves for farm products in 2000. It is supposed that there were no support programs in either year.

-The relatively small shift of the demand curve over the 40 years can be attributed to the fact that

A) the quantity of food demanded does not vary much with the price of food because food is a necessity.
B) consumption of food per capita faces natural limits and hence responds by only a small amount to changes in per capita income.
C) farmers have only limited control over their outputs.
D) there has been rapid technological change in agriculture.
E) poor climatological conditions led to decreasing harvests.