The Following Transactions for March Have Been Journalized and Posted

The following transactions for March have been journalized and posted to the proper accounts. Mar. 1 The business received a $10,000 cash contribution from the owner.
Mar) 2 Paid the first month's rent of $800.
Mar) 3 Purchased equipment by paying $4,000 cash and executing a note payable for $6,000.
Mar) 4 Purchased office supplies for $500 cash.
Mar) 5 Billed a client for $14,000 of design services completed.
Mar) 6 Received $6,000 on account for the services previously recorded.
What is the ending balance in the Service Revenue account?

A) $16,000
B) $10,000
C) $14,000
D) $6,000