In long-run competitive equilibrium, which of the following…

In long-run competitive equilibrium, which of the following must be true?Answer: A Explanation: In long-run competitive equilibrium, three conditions must be met: (1) firms maximize profit by producing where P = MC; (2) free entry and exit drive economic profits to zero, meaning P = ATC; and (3) firms produce at the minimum point of their ATC curves to minimize costs. These three conditions together mean that P = MC = minimum ATC. The other options violate at least one of these equilibrium conditions.