In a small construction firm, a crew supervisor is added for every ten workers employed. The salaries of the crew supervisors are a ____.

In a small construction firm, a crew supervisor is added for every ten workers employed. The salaries of the crew supervisors are a ________.

A. variable cost
B. mixed cost
C. step cost
D. fixed cost

Correct answer is option C. Step cost. Explanation: In a small construction firm, a crew supervisor is added for every ten workers employed. The salaries of the crew supervisors are a step cost.