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 short-term breakeven point of production for a firm operating under perfect competition will most likely occur when:
Option A:price is equal to average total cost.
Option B:marginal revenue is equal to marginal cost.
Option C:marginal revenue is equal to average variable costs.

Answer: A