310Why is the case of the pollen-sprayed milkweed cited in Paragraph 6？ 6540

Why is the case of the pollen-sprayed milkweed cited in Paragraph 6？ 查看材料 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. 请帮忙给出正确答案和分析，谢谢！