Which of the Following Is the Clearest Example of a Preventive

Which of the following is the clearest example of a preventive control?

A) Once each year, a company looks over its payroll records to see if any employee has been paid more money than their authorized salary.
B) Once each year, a company counts its inventory and investigates why some items are missing.
C) Before it accepts any new orders from a customer, it checks to make sure the customer has a good credit rating.
D) The company hires attorneys to sue customers who have not paid their bills.