As prepaid expenses expire with the passage of time, the correct adjusting entry will be a: Select one: O A. debit to an asset account and a credit to an expense account. OB. debit to an expense account and a credit to an asset account. OC. debit to an asset account and a credit to an asset account. O D. debit to an expense account and a credit to an expense account. Mary Richardo has performed $500 of CPA services for a client but has not billed the client as of the end of the accounting period. What adjusting entry must Mary make? Select one: O A. Debit Cash and credit Unearned Service Revenue O B. Debit Accounts Receivable and credit Unearned Service Revenue O C. Debit Accounts Receivable and credit Service Revenue OD. Debit Unearned Service Revenue and credit Service Revenue