A Young Working Couple Earned $35,000 Last Year, and Paid

A young working couple earned $35,000 last year, and paid $10,000 in taxes. They spent $13,000 on rent, food, insurance, and other "necessities." What is their disposable income?

A) $12,000
B) $35,000
C) $22,000
D) $25,000
E) There is not enough information to tell.