If Demand Moves to the Right as Supply Moves to the Right

If demand moves to the right as supply moves to the right, then

A) equilibrium price must increase, but equilibrium quantity may either rise, fall, or remain unchanged.
B) equilibrium price and quantity must both go down.
C) equilibrium quantity must rise, but equilibrium price may either rise, fall, or remain unchanged.
D) equilibrium price and quantity must both go up.
E) none of these occurs.