Answer:
a. affects only income statement accounts.
Step-by-step explanation:
Under the allowance method, writing off an uncollectible account affects only income statement accounts.
When a customer's debt won't be paid off, it's time to call it quits. To write off a failed account, the amount gets taken away from accounts receivable. The finance record is changed by decreasing allowance for doubtful accounts and increasing accounts receivable - consequence: just balance sheet accounts are influenced.