The U.S. tax-transfer system (as distinct from the tax system alone) is

A) progressive.
B) proportional.
C) bimodal.
D) regressive.

Tax-transfer System

The governmental mechanism by which taxes are collected from individuals and businesses, and redistributed through spending programs, often targeting social welfare and public services.

Progressive

Relating to or advocating for progress, change, or improvement, as opposed to wishing to maintain the status quo.

Proportional

Corresponding in size or amount to something else; having a constant relation in degree or number.