There are 4 households in a locality. The annual income of the first household is $20,000, the annual income of the second household is $47,000, the annual income of the third household is $50,000, and the annual income of the fourth household is $71,000.

Refer to the scenario above. Which family pays the lowest percentage of its income as taxes if the government follows a progressive tax system?

A. The first household
B. The second household
C. The third household
D. The fourth household