A sole proprietorship reported the following transactions for the month of March. The transactions have been joumalized and posted to the proper accounts. Mar 1 The business received $9,000 cash from the owner in exchange for capital. Mar. 2 Paid the first month's rent of $700. Mar. 3 Purchased equipment by paying $3,000 cash and executing a note payable for $6,000. Mar. 4 Purchased office supplies for $500 cash. Mar. 5 Billed a client for $13,000 of design services completed Mar. 6 Received $9,000 on account for the services previously recorded. What is the balance in Accounts Receivable? A. $4,000 B. $6,000 C. $9,000 D. $13,000