What Was the Primary Cause of the War Between China

Multiple Choice

What was the primary cause of the war between China and Japan that began in 1931?

A) Chinese encroachment on Japanese territorial fishing sites.
B) The Germans encouragement to the Japanese to attack China.
C) The Japanese concept of implementation of the Final Solution.
D) The Japanese unprovoked attack upon Manchuria.
E) The breakdown of Japanese military neutrality in civilian political matters.