Question

which would be perceived as a threat to the concert of europe goals?
the creation of new national borders that ignore the cultural values of countries
the restriction of trade routes that could strengthen a particular nation over others
the reestablishment of traditional government and monarchies
the unification of smaller countries that join forces to meet their goals

Explanation:

The Concert of Europe aimed to maintain the balance of power and stability in Europe after the Napoleonic Wars. The creation of new national borders that ignore cultural values could lead to ethnic tensions and conflicts, disrupting the stability which the Concert of Europe strived for. Restricting trade routes (if it's not in line with the balance - of - power and cooperation spirit) might also be a threat, but cultural - value - ignoring borders are more fundamental. Re - establishing traditional governments and monarchies was in line with the conservative goals of the Concert of Europe (as many of the powers were monarchies). Unification of smaller countries (if it's within the framework of the balance of power) might not be a threat.

Answer:

the creation of new national borders that ignore the cultural values of countries