Answer:
debit Accounts Receivable $350 and credit Unearned Service Revenue $350.
Explanation:
Based on the information provided within the question it can be said that in order to correct this entry the bookkeeper needs to debit Accounts Receivable $350 and credit Unearned Service Revenue $350. This is because the $350 are coming into the account (debit), but since it is for a future service it also needs to be placed as credit Unearned Services.