Why did germany and japan invade other countries?

What would lead a historian to consider two events to have a relationship of correlation rather than causation?

Enforces the laws.a.legislativeb.executivec.judicial

Which statement best describes a significant cause of world war ii? o a. the economic boom that followed world war i allowed countries to build up huge militaries. o b. the treaty of versailles, which ended world war i, left lasting resentments in many countries. o c. the rise of imperial states in asia caused european powers to unite for their common defense. o d. the league of nations encouraged european states to form secret military alliances.