Heyo! ;D
Answer: "One way in which militarism influenced the nations of Europe prior to the WWI was contributing to a European arms race. Hence, if you are on the same assignment with the options:"
O Militarism threatened the imperial system.
O Militarism caused the alliance system to break down.
O Militarism contributed to a European arms race.
O Militarism discouraged nations from foreign trade.
"...then the answer is Option C."
Hope this helps! Please lmk if it does! :D
~Artastic~