Question

the majority of states have:
a. a flat income tax.
b. a gross income tax.
c. a progressive income tax.
d. no income tax.

Explanation:

In the United States, most states with an income tax use a progressive income tax system, where tax rates increase with income. Flat income tax (A) is less common, gross income tax (B) is not the typical state income tax structure, and only a few states have no income tax (D), so the majority have a progressive income tax.

Answer:

C. a progressive income tax.