For a Given Market Price, a Competitive Firm's Marginal- Revenue

For a given market price, a competitive firm's marginal- revenue curve

A) is a straight line that coincides with the market demand curve.
B) increases to the right and then declines when MC = MR.
C) is the same as the firm's TR curve.
D) is a positively sloped straight line, starting from the origin.
E) is the same as the firm's demand curve.