Use the Figure Below to Answer the Following Questions

Use the figure below to answer the following questions. Figure 11.4.1
-Refer to Figure 11.4.1,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) market supply will increase.
D) firms will enter the market.
E) firms that remain in the market will reduce production.