Suppose the market demand curve for a good passes through the point (quantity demanded = 100, price = $25). If there are five buyers in the market, then
A.
the marginal buyer's willingness to pay for the 100th unit of the good is $25.
B.
the sum of the five buyers' willingness to pay for the 100th unit of the good is $25.
C.
the average of the five buyers' willingness to pay for the 100th unit of the good is $25.
D.
all of the five buyers are willing to pay at least $25 for the 100th unit of the good.