Use the Figure Below to Answer the Following Questions

Multiple Choice

Use the figure below to answer the following questions.

Figure 12.4.3
-Refer to Figure 12.4.3, which shows the cost curves and marginal revenue curve of a firm in a perfectly competitive market. In the long run,

A) firms that remain in the market will expand production.
B) market demand will increase.
C) firms will adopt labour-saving technology.
D) industry output will remain constant.
E) firms will enter the market.