What Prevented the Mongols from Conquering Japan

Multiple Choice

What prevented the Mongols from conquering Japan?

A) The Mongols feared the samurai military prowess.
B) The jungle heat prevented their horses from continuing.
C) A storm prevented them from establishing a base.
D) Mongol tactics were no match for the Japanese military technology.
E) The Japanese launched a surprise attack on the Mongol naval base.