Sam Sells Soybeans to a Broker in Chicago,Illinois

Sam sells soybeans to a broker in Chicago,Illinois.Because the market for soybeans is generally considered to be competitive,Sam maximizes his profit by choosing

A) to produce the quantity at which average variable cost is minimized.
B) to produce the quantity at which average fixed cost is minimized.
C) to sell at a price where marginal cost is equal to average total cost.
D) the quantity at which market price is equal to Sam's marginal cost of production.