i already posted this question but it was wrong please give correct answer

Brickman Corporation uses the allowance method to account for uncollectible receivables. At the beginning of the year, Allowance for Bad Debts had a credit balance of $1,000. During the year Brickman wrote off uncollectible receivables of $2,100. Brickman recorded Bad Debts Expense of $2,700. What is Brickman's year- end balance in Allowance for Bad Debts? a. $1,600 b. $4,800 c. $3,700 d. $600