During Year 4, Tara wrote off $7,000 in receivables and recovered $4,000 that had been written off in prior years. Tara's December 31, Year 3, allowance for uncollectible accounts was $22,000. Under the aging method, what amount of allowance for uncollectible accounts should Tara report on December 31, Year 4?
a. $9,000.
b. $13,000.
c. $19,000.
d. $10,000.