Which statement about progressive taxes is true? A.
The rate increases as income increases.
B.
The rate remains the same, even if income increases or decreases.
The rate decreases as income increases.
D.
The rate increases as income decreases.

A.   The rate increases as income decreases.

Explanation:

The main purpose of a progressive taxes is to make people who earn more through their earning to contribute more to the programs/infrastructures that's planned by the government.  In order to achieve this, the government impose a higher tax rates for the people in higher income brackets and lower tax rates to the people in lower income brackets.

Almost every nations in the world use progressive taxes.

As an example, here's the income Tax's regulation for the people who live in United States.

10% Tax rate for a single person who earn     Up to $9,875

12%  Tax rate for a single person who earn     $9,876 to $40,125

22%  Tax rate for a single person who earn$40,126 to $85,525

24%  Tax rate for a single person who earn$85,526 to $163,300

32% Tax rate for a single person who earn  $163,301 to $207,350

35%  Tax rate for a single person who earn$207,351 to $518,400

37%  Tax rate for a single person who earnOver $518,400

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.