Pls assist with the Prep Qn!

specky

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

I go for E. Can someone advise? Thanks.

snoopy55

E的would，是虚拟，如果前面occur了，那他就would了

原来我选A，看will it have语序不对。E更好。