Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The marginal revenue per unit sold for a firm doing business under conditions of perfect competition will most likely be:
Option A:equal to average revenue.
Option B:less than average revenue.
Option C:greater than average revenue.

Answer: A