How did nationalism, militarism and alliances lead to World war one?

After creation of Italy and Germany as independent countries there was a wide disagreement between them and countries that were colonial powers. That is why two military blocks were created so that countries could defend their interests.

Explanation:

Two alliances were created. On one side there was Entente (Russia, Britain and France), while on the other there were Central Powers (Germany, Italy, Austria-Hungary). Most of the countries felt that large and efficient military is a base for the development of country. That and strong of national pride were two main premises. That is why this period of large differences fueled by this factors led to beginning of WW1.

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possibly the answer is c