The ________ part of a perfectly competitive firm's marginal cost curve is the firm's short-run supply curve.

A) rising
B) falling
C) horizontal
D) backward-bending

Marginal Cost Curve

A graphical representation that shows how the cost of producing one more unit of a good changes as the quantity produced increases.

Short-run Supply Curve

A graphical depiction that showcases how much of a product suppliers are willing and able to sell at different prices in the short run, with at least one input fixed.