The correct answer is D) Nationalist movements.
Organizations such as Young Italy, Young Germany, Young Hungary, and Young Ireland all inspired Nationalist movements.
A nationalist movement focuses on promoting the values, traditions, and customs of a nation to keep its sovereignty. It tries to defend from the foreign ideas or influences that could threaten the foundation of the particular nation.
The other options of the question were A) imperialism. B) isolationism. C) Social Darwinism.