On December 1, Accounts Receivable has a debit balance of $6,400 and Allowance for Bad Debts has a credit balance of $300. On December 31, the company determined it could not collect $85 from Charter Company and wrote if off using the allowance method. What is the net realizable value of Accounts Receivable on December 31?
A. $6,615
B. $6,100
C. $6,315
D. $6,485