A Cubic Specification for a Short-Run Production Function Is Appropriate $\text { U }$

Multiple Choice

A cubic specification for a short-run production function is appropriate when the scatter diagram indicates

A) an S-shaped total product curve.
B) marginal product of labor falls throughout the range of labor usage.
C) total product is decreasing throughout the range of labor usage.
D) an S-shaped marginal product of labor curve.
E) a $\text { U }$ -shaped marginal product of labor curve (MP first falls and then rises as labor usage increases.