When the price of apples changes, the demand curve for apples _______.
A、shifts because the price of apples is measured on the vertical axis of the graph
B、shifts because the quantity demanded of apples is measured on the horizontal axis of the graph.
C、does not shift because the price of apples is measured on the vertical axis of the graph
D、does not shift because the price of apples is measured on the horizontal axis of the graph