If a Perfectly Competitive Firm Charges the Market Price of $14

If a perfectly competitive firm charges the market price of $14 per unit,

A) its marginal revenue is $14, and its average revenue is less than $14 per unit
B) it will sell no output
C) its average revenue is $14, and its marginal revenue is less than $14 per unit
D) its average revenue is $14, and its marginal revenue is $14
E) its average and marginal revenue are $14 only for the first unit sold