If industrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human health, causing a rise in the incidence of skin cancer and eye disease, and perhaps even threatening global ecological systems.
(A) and perhaps even threatening
(B) and may even threaten
(C) and even a possible threat to
(D) as well as possibly threatening
(E) as well as a possible threat to
这句话的平行结构应该是怎样的，划线前的causing是和什么对应？
答案是不是选Ｂ啊？threaten应该是与endanger对应
我觉得causing是个状语，修饰前面的部分
这个是我的理解，正确答案是什么啊
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