Answer:
A) Accounts Receivable.
Cash.
Explanation:
A not sufficient funds (NSF) check is a check that a company received form a client and it was deposited in the company's checking account but it bounced because the customer's account didn't have enough funds to cover the check.
The entry to record receiving the check was:
Dr Cash
Cr Accounts receivable
So now that journal entry must be reversed:
Dr Accounts receivable
Cr Cash
Since checks are practically considered money, they increase or decrease cash account.