If supply is unchanged, but demand increases, we can conclude that the new equilibrium:
a. Quantity must increase but market price may fall, stay the same or even increase.
b. Price must fall but market quantity may fall, stay the same or even increase.
c. Price must increase but market quantity may fall, stay the same or even increase.
d. Quantity must decrease but market price may fall, stay the same or even increase.
e. Both market quantity and market price must increase.