In the Description of Labor Costs Associated with Fishing, the Textbook

In the description of labor costs associated with fishing, the textbook measures the cost of labor that corresponds with different quantities of fish. Which of the following statements is true?

A) Labor costs for fish production cannot be estimated.
B) The cost of labor increases at an increasing rate at low levels of output.
C) Labor costs increase at the same rate over all ranges of output.
D) At higher levels of output, the cost of labor increases at an increasing rate.
E) At higher levels of output, the cost of labor decreases at an increasing rate.