What is the idea that one's country is the best, and that everything should be
done to increase its wealth, power, and prestige?
imperialism
nationalism
isolationism
enlightenment

B. Nationalism

Explanation:

Nationalism is an ideology that refers to the loyalty and advocacy to a particular nation. When someone is considered a nationalist, he/she fully supports the interests of their nation and puts then above all others.

A nationalist would consider their own country the best and seek to promote the wealth, power, image, and prestige above everything else. It is important to mention that he or she does not seek to increase their own power but the power of their own nation.

answer; the trial de novo