Question

The United States disagrees with a government of a foreign country. So it imposes a(n) _____ on trade between the two countries.
standard
subsidy
embargo

Answer 1

The answer is embargo.

Standard- Normal
Subsidy- Form of financial aid.
Embargo- Impose a ban on trade on a country.

And if you disagree with a country, you're more likely to embargo them rather than subsidy them and standard pretty much makes no sense in the sentence.

Answer 2

The correct answer is embargo.

The trade embargo is a way of negatively influencing a country's trade relations with the rest of the international community. It is a way of retaliating against a country that behaves inappropriately, be it in the commercial, nuclear, political or ideological sphere.

The US has already imposed many embargoes on countries with a socialist tradition, such as Cuba and North Korea, and in countries with warlike purposes, such as Iran and North Korea itself.