MY TEST IS TIMED NEED HELP 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 nation's interests by encouraging the production of homeland goods.

Europe needs to build a trump-like wall that will spread across europe making it impossible for migrants to cross they need to spread pig guts all over this wall so the muslims will never consider crossing into europe..you might be asking "can't they just fly over with planes? " well yes they can so we will install thaad missile protections system to shoot down any aircraft that violates europe's air fourth would be to start a fourth reich in germany.. last but not least.. make europe great again!

D: sill  is what it is on edgenuity!