Answer:
A. Embargo
Explanation:An embargo is a trade barrier put in place by a nation for violations against it treaty with another nation stopping/banning all trade from the a violating nation. This is meant to act as a punitive measure and help to make the violating nation correct it's errors/ stand on the treaty. Countries like Cuba,Sudan,North Korea and Syria are on the U.S embargo list. Embargoes may be removed onces the treaty conditions are restored or if the violating nation shows some commitments towards ratifying the treaty.