ending balance in the Allowance for uncollectible accounts

A newly created design business called Smart Art is just finishing up its first year of operations. During the year, there were credit sales of $40,000 and collections of $36,000. One account for $650 was written off. Smart Art uses the aging method to account for uncollectible account expense, and has calculated an amount of $200 as their estimate of uncollectible amounts at year-end. At the end of the year, what is the ending balance in the Allowance for uncollectible accounts?
A) $150
B) $800
C) $200
D) $1,450