Refer to Scenario 7

Multiple Choice

Refer to Scenario 7.8 below to answer the question(s) that follow.
SCENARIO 7.8: A swimming pool cleaning company has the following production possibilities. With one, two, three, and four workers, the company can clean 5, 12, 17, and 20 pools per day, respectively.
-Refer to Scenario 7.8. The marginal product of the fourth worker is

A) 2.
B) 3.
C) 17.
D) 20.