If the Demand Curve for Desktop Computers Shifts Rightward and at the Same

If the demand curve for desktop computers shifts rightward and at the same time the supply curve shifts leftward, then

A) the equilibrium quantity definitely increases.
B) the equilibrium quantity definitely remains the same.
C) more information is needed to determine the effect on the equilibrium quantity.
D) the equilibrium quantity definitely decreases.
E) the equilibrium price definitely falls.