A Monopolistically Competitive Firm Is in Long-Run Equilibrium

A monopolistically competitive firm is in long-run equilibrium.It is selling 10 units of output at a price of $5 per unit.It can be inferred that,at this level of output,

A) marginal cost is equal to $5.
B) marginal revenue is equal to $5.
C) marginal revenue is greater than $5.
D) average total cost is equal to $5.
E) average total cost is less than $5.