The Demand Curve for Apples Is Downward-Sloping Because

The demand curve for apples is downward-sloping because

A) when fewer apples are produced, the money in people's apple budgets does not have to stretch as far.
B) there must have been an apple blight, so there must be fewer apples to buy.
C) when apple prices rise, the price of other goods must also be rising, so people cannot afford to buy as much.
D) at higher apple prices, people will seek other, relatively cheaper alternatives, like pears, oranges, or plums.
E) at higher prices, apples are more expensive to produce, so fewer are grown.