Shama Is Producing Candles in a Perfectly Competitive Market

Shama is producing candles in a perfectly competitive market.When she produces 500 candles,her total cost is $250.If she produces one additional candle,her total cost increases to $260.In order to maximize her profit,she should produce the additional candle

A) if the market price for a candle is $12.
B) only if the market price exceeds $260 for a candle.
C) only if the market price exceeds $250 for a candle.
D) if the market price for a candle exceeds $0.50.
E) if her price exceeds her average total cost.