According to a Swedish study, it is sixty times as likely that parachutists who participate in extreme sports will die from a BASE jump as they are from skydiving.
The correct idiom is as likely X as Y or X more than Y.
A.
it is sixty times as likely that parachutists who participate in extreme sports will die from a BASE jump as they
areGMAT does not prefer a sentence starting with it. Pronouns like "it" are usually placeholders for nouns.
B.
it is sixty times more likely for parachutists who participate in extreme sports to die from a BASE jump than they are
Same as A
C. parachutists who participate in extreme sports are sixty times more likely to die from a BASE jump
asMore should be followed by than
D. parachutists who participate in extreme sports are sixty times as likely to die from a BASE jump as
it is for them
Same issue as A & B, it is usually a placeholder for noun.
E. parachutists who participate in extreme sports are sixty times more likely to die from a BASE jump than
This is the correct answer.
Rewriting the complete comparison,
parachutists who participate in extreme sports are sixty times more
likely to die from a BASE jump than <parachutists who participate in extreme sports are likely to die> from skydiving.
If the subject/doer and verb phrase are same on both sides of comparison , we don't have to repeat them in the second half of comparison for simplicity
E is the answer IMO