The Industry That Produces Zangs Is in Long-Run Equilibrium

The industry that produces zangs is in long-run equilibrium. Then the demand for zangs increases permanently. As a result, firms in the industry will ________. Some firms will ________ the industry, and the industry supply curve will shift ________.

A) make economic an profit; enter; rightward
B) make zero economic profit; exit; leftward
C) incur economic losses; exit; rightward
D) incur economic losses; exit; leftward