What are 4 main causes of WWl?

Explanation:

One way to remember the FOUR main causes of World War I is to remember the acronym M – A – I – N. (M = Militarism, A = Alliances, I = Imperialism, and N = Nationalism.) MILITARISM was one of the four major causes of the war. It was an “arms race.” Because Britain had a large navy, Germany wanted a large navy too.

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.