European countries built up enormous armies to protect their colonies considered as one cause of World War I.
Answer: Option D
Explanation:
The power was raised to such a height that it was divided into two. The main spark was ignited with the murder of Archduke Ferdinand and his wife. And it was believed to have been plotted by the Serbians though it was plotted by the Yoguslavist.
This all led to the military power which was building up to make up stronger, led to the breakage of European alliance leading to the Austria - Hungary declaring war on Serbia.
The consideration of causes of the eruption of First World War was the militarism. Therefore, the correct answer is that the European countries was building and has made the enormous military in order to protect their colonies.
