Which One of the Following Is NOT an Explanation of the Expansion

Which one of the following is NOT an explanation of the expansion of World War I to Asia,Africa,and the Pacific?

A) European nations carried their animosities into their colonies.
B) Japan saw the war as an opportunity to grab German colonies.
C) The German invasion of neutral Belgium was a profound breech of international law.
D) Europeans were forced to recruit soldiers from their colonies because of the demands of the war.
E) The principal actors entered the war for reasons that had nothing to do with the murder of Francis Ferdinand.