Question

(MC)Which of these was directly responsible for the outbreak of World War I in Europe?

Answer 1

factors responsible for outbreak of world war -I:

1.mutual defence alliance 
2.imperialism
3.militarism
4.nationalism

The immediate cause was assassination of Archduke Franz Ferdinand

Answer 2

Here, I have proposed the completion of your question along with options and answer.

Which of these was directly responsible for the outbreak of World War I in Europe?

A. Entangling alliances

B. U.S. imperialism

C. Unrestricted submarine warfare

D. Colonial independence movements

The correct answer for your question is option (A) – Entangling alliances.