Answer:
C) An estimated warranty liability of $68,000.
Explanation:
Since Swift will record an estimate of warranty expense, it must also include the costs of the new recall. It's warranty liability account already had a credit balance of $28,000, but it must be adjusted to show the real estimated costs = $28,000 + $40,000 = $68,000. Therefore, warranty liability should have a $68,000 credit balance in the balance sheet.