Read the passage given below and answer the question based on it.
Nationalism, aligned with imperialism, led Europe to disaster in 1914. But meanwhile, many countries in the world that had been colonized by the European powers in the nineteenth century began to oppose imperial domination. The anti-imperial movements that developed everywhere were nationalist, in the sense that they all struggled to form independent nation states, and were inspired by a sense of collective national unity, forged in confrontation with imperialism. European ideas of nationalism were nowhere replicated, for people everywhere developed their own specific variety of nationalism. But the idea that societies should be organized into 'nation-states' came to be accepted as natural and universal.
What led to the collapse of Europe in 1914?
A. massive civil unrest due to poverty
B. an attack from the colonized countries around the world
C. the internal struggle amongst nations to expand their territory
D. ongoing rebellions against existing monarchs in multiple territories
