On janurary 1, year 1, the accounts receivable balance was 20,100 and the balance in the allowance for doubtful accounts was 1,700. on janurary 15, year 1, an $490 uncollectible account was written off. what is the net relizable value of accounts receivable immediately after the write off?

a) 19,610

b) 18,400

c) 18,890

d)17,910