The Following Transactions for the Month of March Have Been $\$ 7,000$

The following transactions for the month of March have been journalized and posted to the proper accounts. Mar, 1 The business received $\$ 7,000$ cash and issued common stock to stockholders.
Mar. 2 Paid the first month's rent of $\$ 500$ .
Mar. 3 Purchased equipment by paying $2,000 cash and expcuting a note payable for $6,000.
Mar. 4 Purchased office supplies for $\$ 700$ cash.
Mar. 5 Eilled a client for $12,000 of design services completed.
Mar. 6 Received $\$ 9,000$ on account for the services previously recorded. What is the balance in Accounts Receivable?

A) $9,000
B) $3,000
C) $6,000
D) $12,000