Annie's Fitness sells a set of free weights to a customer for which Annie's had paid $750. Which one of the following statements describes the most appropriate accounting for the transaction?

a. Debit cost of goods sold expense $750; credit cash $750
b. Debit inventory $750; credit cost of goods sold expense $750
c. Debit cost of goods sold expense $750; credit inventory $750
d. Debit inventory $750; credit accounts payable $750