__________ accounts show the amount of money owed to the firm by customers.

A. Supply
B. Prepaid
C. Receivables
D. Payables
C

The correct answer is C. Receivables.

To determine the correct answer, we need to understand what all the options mean.

A. Supply accounts typically refer to the inventory or materials owned by the firm.
B. Prepaid accounts represent payments made in advance for goods or services that will be received in the future.
C. Receivables accounts show the amount of money owed to the firm by customers. It represents sales that have been made on credit.
D. Payables accounts represent the amount of money that the firm owes to its suppliers or creditors.

Given that we are looking for the accounts that show the amount of money owed to the firm by customers, the correct answer is C. Receivables.