Answer: Debit to Product Warranty Payable
Explanation: Product Warranty Payable is a liability account that has a credit balance. To increase a liability a credit is recorded while to reduce a liability a debit is recorded to the liability.
The seller maintains the warranty as a liability and initially records a debit to its product warranty expense and a credit to its product warranty Payable.
When a repair is done on a product under warranty, the seller records a debit to the product warranty Payable to reduce it’s liability.
Also, a debit to either supplies or cash will increase the expense and assets accounts respectively which will amount to incorrect journal entries.