Use the Following to Answer Question

Multiple Choice

Use the following to answer question:
Figure: Profit Maximization in Monopolistic Competition
-(Figure: Profit Maximization in Monopolistic Competition) Use Figure: Profit Maximization in Monopolistic Competition.When the demand curve for a firm in monopolistic competition shifts,the marginal revenue curve:

A) must also shift.
B) shifts in the opposite direction.
C) will stay the same.
D) will shift,but the profit-maximizing quantity will not change.