The existence of under - or overapplied overhead at the end of the year: a. requires a retroactive adjustment to the cost of all jobs completed. b. indicates that an error has been made. c. requires an adjustment to Cost of Goods Sold. d. is written off as a bad estimate expense.

Option "C" is the correct answer to the following question.

Explanation:

Cost of goods sold includes all types of expenses related to a product.

Any type of expenses during the year can be adjusted in the cost of goods sold for that product. underdeveloped or overdeveloped overhead can also be adjusted in the cost of goods sold for the particular year.

so the correct answer to the given statement is the Cost of Goods sold.