Which of the Following Is the Most Common Reason States

Multiple Choice

Which of the following is the most common reason states have historically gone to war?

A) Two states claim the same territory.
B) A state resents another state's high tariffs on its imports.
C) The populations of two states are composed of two conflicting ethnic groups.
D) A state wants a neighboring state to change into a democratic government.
E) A state thinks another state is cheating on an arms-reduction agreement.