A．Because they are not accustomed to it.B．Because they are not psychologically prepare

A．Because they are not accustomed to it.

B．Because they are not psychologically prepared for it.

C．Because their genes differ from those who have been tested for it.

D．Because they are less sensitive to it than those who have been tested for it.

请帮忙给出正确答案和分析，谢谢！

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