Suppose a Negative Income Tax Program Is Established at 25

Suppose a negative income tax program is established at 25 percent, and a poverty threshold minimum of $15,000 is guaranteed for a family of four. What is the highest income a family could earn in the workplace before being cut out of the governmentprogram?

A) $20,000
B) $15,000
C) $18,750
D) $60,000
E) $10,000