The Figure Below Depicts a Production Function for a Firm

Multiple Choice

The figure below depicts a production function for a firm that produces cookies.
Figure 12-4
-Refer to Figure 12-4. With regard to cookie production, the figure implies

A) diminishing marginal product of workers.
B) diminishing marginal cost of cookie production.
C) decreasing cost of cookie production.
D) increasing marginal product of workers.