In the Following Diagram of a Perfectly Competitive Firm, What

In the following diagram of a perfectly competitive firm, what is likely to happen in the long run in this industry?

A) Some firms will exit the industry, reducing the market price.
B) Some firms will exit the industry, raising the market price.
C) New firms will enter the industry, reducing the market price.
D) New firms will enter the industry, raising the market price.