During 2012, abc company had $500,000 net credit sales. Accounts receivable has a December 31, 2012, balance of $100,000. No amounts have been added to the allowance for doubtful accounts during 2012. Before adjustment on December 31, 2012 the net credit sales will become uncollectible. What will be the adjustments balance un allowance for doubtful accounts at December 31?
a. $3,000
b. $5,000
c. $13,000
d. $15,000
e. $17,000