A partnership is owned by a mother (60%) and her son (40%). Their capital accounts are maintained in the same ratio. The son received his ownership interest as a gift from his mother several years ago. Partnership income for the current year was $50,000. Although the mother performed services valued at $10,000, there was no entry on the partnership books and she received no cash for her services. To avoid a reallocation by the IRS, what amount should be allocated to the mother?

A. $20,000

B. $30,000

C. $34,000

D. $40,000