Answer:
c.Customer refunds payable, accounts receivable, merchandise inventory, and estimated returns inventory
Step-by-step explanation:
When merchandise that was sold on account is returned, the accounts that are affected are:
Accounts Receivable which is credited to reduce the amount the customer is owing OR that is receivable from customer.
Returns Inventory is debited to reduce sales amount and A second entry must also be made to debit merchandise inventory to add back the returned items to stock.