(Figure: The Profit-Maximizing Firm in the Short Run) Use Figure: The Profit-Maximizing Firm in the Short Run.At q₂,ATC is the vertical distance between q₂ on the horizontal axis and:

A) curve M.
B) curve N.
C) curve O.
D) P₄.

ATC (Average Total Cost) is represented by the curve that shows the cost per unit at different levels of output. In the context of a profit-maximizing firm in the short run, the ATC is typically depicted as a curve that first decreases, reaches a minimum point, and then increases as output increases, due to economies and diseconomies of scale. Without seeing the figure, the correct answer is inferred based on standard economic models where ATC is represented by a distinct curve separate from marginal cost or demand curves. Curve N is likely the correct choice as it fits the description of an ATC curve.