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
I think it's C for this one.
A - doesn't maintain parallelism between a rise and threatening
B - again, parallelism is lost
C - maintains the structure - causing a rise and even a possible threat to
D - I was initially going for D. I can't point what's wrong here.
E - again, I was a little confused.
For D and E, somehow the "as well as" part put me off! Anyone want to point out why I am right/wrong?