Which of the Following Statements Is False

Which of the following statements is false?

A) Explicit costs of using market-supplied resources entail an opportunity cost equal to the dollar cost of obtaining the resources in the market.
B) When economic profit is zero,the firm's owners could NOT have done better putting their resources in some other industry of comparable risk.
C) If economic profit is positive,accounting profit must also be positive.
D) If economic profit is negative,accounting profit must also be negative.
E) None of the above statements is false.