Unreasoning enthusiasm for the glorification of one's country

Answer: Option D

One word substitute is Chauvinism.

Communism: a theory or system of social organization in which all property is owned by the community and each person contributes and receives according to their ability and needs.
Imperialism: a policy of extending a country's power and influence through colonization, use of military force, or other means.
Patriotism: the quality of being patriotic; devotion to and vigorous support for one's country.
Chauvinism: exaggerated or aggressive patriotism.