Question

one primary purpose of the european union is to
allow highly skilled workers to be employed.
establish a free trade zone in the marketplace.
create a common market.
eliminate borders between countries.

Explanation:

The European Union's primary purpose includes creating a common market, establishing a free - trade zone, and allowing the free movement of workers (including highly - skilled ones) and eliminating trade - related borders (not physical borders in all senses) between member countries. Among the options, "create a common market" is a core and well - recognized primary purpose of the EU as it aims to have a single market with free movement of goods, services, capital, and labor.

Answer:

create a common market.