Which of the Following Statements Is False

Which of the following statements is false?

A) Given the nature of cost curves, positive economic profits can only induce entry of new firms.
B) Entry and expansion can occur at the same time in the same industry.
C) When positive economic profits prevail in an industry, firms often expand.
D) When economic profits are negative, firms might leave an industry.
E) An industry ceases to either expand or contract when economic profits are zero.