Having some trouble with this problem. I would appreciate to know the steps on how to solve for it.

Segoe Inc. uses FIFO for internal purposes and LIFO for income tax and external reporting purposes. At the end of the year, the inventory records of Segoe Inc. include the following items. The entry to adjust the inventory allowance to reduce FIFO inventory to LIFO inventory at the end of 2021 would include what amount? Select one: a. A debit to cost of goods sold for $60,000. b. A credit to cost of goods sold for $15,000. c. A debit to cost of goods sold for $60,000. d. A debit to cost of goods sold for $15,000