The increased investment in European militaries contributed to the start of World War I.
What was happened in World War I?
At the time of World War I, the horrors of trench battle and fatal new technologies such as poison gas and army tank were presented to the terrestrial planet during World War I, that survived from 1914 to 1918.
The outcome was some of the untold heinous murder the world has always watched, with more than 16 million soldieries and civilians kill off. During that time, there was increased military spending in Europe, contributed to the outbreak of World War I.
Therefore, option C is correct.
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