. An auditor is comparing the write-off of uncollectible accounts as a percentage of total accounts receivable with previous years. A possible misstatement this procedure could uncover is

a. overstatement or understatement of sales.

b. overstatement or understatement of accounts receivable.

c. overstatement or understatement of bad debt expense.

d. overstatement or understatement of sales returns and allowances.