Demand Curve

47. The following is a complete and correct definition of the demand curve for commodity X.  The demand curve shows, for a given market:
A) how much of X would be bought at the equilibrium price.
B) how, as people's incomes rise and they have more money to spend, their purchases of X would increase.
C) how the amount of money people spend to purchase X changes as the price they must pay for it changes.
D) the amounts of X that would be bought each period, at each and any price, assuming other factors influencing demand (incomes, tastes, etc.) remain constant.
E) the amounts of X that would be bought each period if taxes were to go down