I need answer ASAP!

At the beginning of the year, the balance in the Allowance for Doubtful Accounts is a credit of $666. During the year, $484 of previously written off accounts were reinstated and accounts totaling $893 are written off as uncollectible. The end-of- year balance (before adjustment) in the Allowance for Doubtful Accounts should be the one listed below. Oa $666 Ob. $257 Oc. $893 Od. $484