Q. Suppose the point of tangency that characterizes long-run equilibrium for a monopolistically competitive firm occurs at Q1 units of output. This level of output,
a. Exceeds the level of output at which marginal revenue equals marginal cost
b. Exceeds the level of output at which marginal cost equals average total cost
c. Falls short of the level of output at which price equals marginal cost
d. Exceeds the firm's efficient scale of output.