During July, the following transactions occurred: July 1 - Purchased $10,500 of merchandise on account. July 10 - Purchased $1,200 of merchandise with cash. July 15 - Purchased $800 of office supplies on account. July 20 - Made a payment of $5,500 on accounts payable. July 30 - Purchased $1,300 of office supplies with cash. Assume a perpetual inventory system is used. What would be the amount to debit as a posting to Accounts Payable from the cash payments journal at the end of the month? A. $11,700 B. $6,300 C. $12,500 D. $5,500