单选题：Why is the case of the pollen-sprayed milkweed cited in Para

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题目内容：
Why is the case of the pollen-sprayed milkweed cited in Paragraph 6? A．It is cited to show GM foods can kill insects effectively.
B．It is cited to show GM foods contain more protein.
C．It is cited to show GM foods also have a dark side.
D．It is cited to show GM foods may harm crops.

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