Refer to the Graphs Shown, Which Depict a Perfectly Competitive

Refer to the graphs shown, which depict a perfectly competitive market and firm. If market demand is D₀:

A) this market is in long-run equilibrium because the firm is earning positive economic profit.
B) this market is in long-run equilibrium because the firm is earning zero economic profit.
C) this market is in short-run equilibrium but not long-run equilibrium.
D) the firm will raise the price above P₀ to increase profit.