In Its Simplest Form, the Long-Run Market Supply Curve Is

In its simplest form, the long-run market supply curve is a(n) :

A) horizontal line at the shut-down price.
B) horizontal line at the price where accounting profits equal zero.
C) vertical line at the quantity produced by the firm.
D) upward-sloping line equal to the marginal cost curve.
E) upward-sloping line equal to the marginal cost curve only above the minimum average variable cost (AVC) .