Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions:
Figure: Profit Maximization for a Firm in Monopolistic Competition
-(Figure: Profit Maximization for a Firm in Monopolistic Competition) Look at the figure Profit Maximization for a Firm in Monopolistic Competition. Suppose that an innovation reduces a firm's costs from ATC to ATC'. Before the innovation reduced the cost, the firm's maximum economic profit was:

A) $0.
B) $30.
C) $750.
D) $4,500.