The Accounting Records for Patricia Event Planning Services Include the Following

The accounting records for Patricia Event Planning Services include the following select unadjusted balances on December 31,2016: Salaries Expense,$6,000; Service Revenue: $19,000; Unearned Revenue,$400; Supplies Expense,$600; Rent Expense,$300; Depreciation Expense-Equipment,$200. During December,the company worked with a new client and provided event planning services for an upcoming event.It will receive the full amount of $2,400 when the event is completed in January 2017.As of the end of December 2016,it performed one-third of the services covered by the contract.The company made the accrual adjustments.The balance of Service Revenue,as shown on the adjusted trial balance,should be a ________.

A) debit balance of $21,400
B) credit balance of $19,000
C) debit balance of $2,400
D) credit balance of $19,800