题目内容
（请给出正确答案）
[主观题]
According to paragraph 4, what can be inferred about investors before the Great Depression
？
A．They invested too heavily in dotcom stocks.
B．They were motivated by a greed that was wholly self-destructive.
C．They did not understand the stock market as well as we do now.
D．They could only invest in bonds and gold because there were no stocks.
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