What was the main cause of the Second World War?

What was the main cause of the Second World War?
A、The main cause was big power struggle for control of the world.
B、It was the world-wide economic crisis.
C、It was the military expansion of Japan and Germany.
D、Both B and C.
【正确答案】：A
【题目解析】：本题考查第二次世界大战爆发的主要原因。根据课本P312可知，第二次世界大战爆发的主要原因是大国之间争夺世界控制权的斗争。