问一道题

93. Those skeptical of the extent of global warming argue that short-term temperature data are an inadequate means of predicting long-term trends and point out that the scientific community remains divided on whether significant warming will occur and what impact will it have if it does.

A. on whether significant warming will occur and what impact will it have if it does.

B. on whether warming that occurs will be significant and the impact it would have

C. as to whether significant warming will occur or the impact it would have if it did

D. over whether there will be significant warming or the impact it will have

E. over whether significant warming will occur and what impact it would have

答案是什么

选E

what impact it would have虚拟语气

啊？可以给与讲解下吗？多谢了