The accounting records for Social Event Planning Services include the following select unadjusted balances on December 31, 2018: Salaries Expense, $6,000; Service Revenue: $18,000: 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 $1,800 when the event is completed in January 2019. As of the end of December 2018, 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 O A. credit balance of $18,000 OB. credit balance of $18,600 O C. debit balance of $1,800 OD. debit balance of $19.800