Historians have proposed various causes of the First World War, including: Nationalism Imperialism Militarism The Alliance System A) Briefly explain why ONE of the developments on the list above represents the most significant cause of the First World War. Provide at least ONE piece of evidence to support your explanation. B) Briefly explain why ONE of the other developments on the list above represents a less significant cause of the First World War than the one you selected in part A. C) Briefly explain which ONE of the developments on the list above played a significant role in contributing to the cause of World War II.