Profit Maximization and Output levels

In the real world, business decisions must be made through insight, trial, and error, without perfect knowledge about demand and costs. Will the profit-maximizing prices and levels of output from the simple economic models still be good guides to real outcomes?

A) No, because the simple economic models ignore the opportunity cost of resources.
B) No, because even entrepreneurs who are able to find the profit-maximizing prices and level of output will be unable to compete with other entrepreneurs who charge higher prices.
C) Yes, because they can hire economists who have sufficient knowledge of costs and demand conditions.
D) Yes, because the entrepreneurs who are best able to find the profit-maximizing prices and output levels will survive and expand, driving others out of competitive markets.