Extreme nationalism is a trait shared by both Communist and Fascist regimes. What is the definition of nationalism? :

a.) A policy of avoiding political or military involvement with other countries.

b.)Belief that people should be loyal to their nation.

c.)Government should have control over every aspect of public and private life.

d.)Policy of glorifying military power and keeping a standing army

A policy of avoiding political or military involvement with other countries ( A )

Explanation:

Nationalism is a way/ a policy where by citizens believe that it is best that a nation is ruled by its self without the interference of external nations. this policy belief that people should be loyal and patriotic to their homeland  especially to the exclusion of the interest of other nations.

That is avoiding political or military involvement with other countries that might benefit those countries rather than their homeland. Nationalism is quite different from patriotism   because patriotism gives room for alliances with other nations .

definitely a for sure. ill see and update if i get the answer