What is the long run wellfare effect?

Text Exercise 5.8 What is the long-run welfare effect of a profit tax (the government collects a specified percentage of a firm's profit) assessed on each competitive firm in a market? Assume the market is in long-run equilibrium before the profit tax. Also assume the profit tax is on economic profit. The tax on economic profit will O A. decrease surplus by decreasing the market quantity. O B. increase surplus by increasing the market price. O C. decrease surplus by decreasing firm profit. O D. decrease surplus by driving firms out of business. O E. not affect surplus by leaving the market price unchanged