The Supply of Seats for an Economics Class at 10

The supply of seats for an economics class at 10 a.m.is the same as the supply of seats for the same class at 12 noon,but while every student who wants to attend this class at 12 noon can,not every student who wants to attend the 10 a.m.class can.Tuition does not vary by time.It follows that the demand for the 10 a.m.class is __________ the demand for the 12 noon class.

A) lower than
B) the same as
C) greater than
D) either a or b
E) none of the above