The Great Depression was induced by all the follwing causes but

The Great Depression was induced by all the follwing causes but ________.
A、stock market speculation
B、credit over-expansion
C、government involvement
D、lack of control over the banking system
【正确答案】：C
【题目解析】：本题考查美国的经济大萧条。根据课本P210可知，大萧条是由以下原因引起的: 股市投机、信贷过度扩张、对银行体系缺乏控制。