Question: What will happen to the equilibrium price level and the equilibrium quantity of output if the aggregate demand curve shifts to the right? Assume an upward sloping aggregate supply curve.
A: The equilibrium price level increases while the equilibrium quantity of output decreases.
B: The equilibrium price level decreases while the equilibrium quantity of output increases.
C: The equilibrium price level and quantity of output increase.
D: The equilibrium price level and quantity of output decrease.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.