Why do nations establish trade barriers? A. trade barriers promote equality among nations, ensuring that everyone produces similar products
B. trade barriers eliminate sanctions and embargoes between nations
C. trade barriers limit the movement of people from one nation to another
D. trade barriers protect a nations intetests by encouraging the production of homeland goods

Correct answer is D. trade barriers protect a nations interests by encouraging the production of homeland goods

Explanation:

D is the correct answer as it refers to policy known as protectionism, in which countries are protecting their interest by producing certain goods they don't want to import.

A is not correct as this doesn't ensure similar production, but quite on the contrary.

B is not correct as it can actually lead to the creation of certain barriers.

C is not correct because it doesn't have to mean that people were travel less because of this.