The Following Transactions for March Have Been Journalized and Posted $\$8, 000$

The following transactions for March have been journalized and posted to the proper accounts. Mar, 1 The business received $\$8, 000$ cash and issued common stock to stockholders.
Mar. 2 Paid the first month's rent of $\$ 600$ .
Mar. 3 Purchased equipment by paying $1,000 cash and expcuting a note payable for $4,000.
Mar. 4 Purchased office supplies for $\$ 650 \mathrm { cash }$ .
Mar. 5 Eilled a client for $13,000 of design services completed.
Mar. 6 Received $\$ 7,000$ on account for the services previously recorded. What is the ending balance in the Service Revenue account?

A) $15,000
B) $8,000
C) $13,000
D) $7,000