Janitors Clean the Factory at the End of Each Workday

Multiple Choice

Janitors clean the factory at the end of each workday.The wages of the janitors are used to determine the cost of the only manufactured product in the factory.What is a good cost driver for the wages of the janitors?

A) number of janitors
B) number of kilowatt hours used
C) number of machine hours on cleaning machines
D) number of labor hours worked by janitors