In the late 1980s the frog Epipedobates tricolor

[NandishSS]

In the late 1980s the frog Epipedobates tricolor was found to produce a previously unknown compound that is 200 times a more effective painkiller as morphine is.

A) that is 200 times a more effective painkiller as
B) that has 200 times more effectiveness as a painkiller than
C) with 200 times more effectiveness as a painkiller than
D) that is 200 times more effective as a painkiller as
E) that is 200 times more effective as a painkiller than

OA:E

Source :GMATPrep EP2

Please explain POE

[meenakshimiyer]

When we use "more" while comparing two things, we should always use "than" instead of "as". So, answer choice A and D are out. Here, we have to maintain parallelism for "morphine" and "new compound". Use of "has" and "with" shows possession, which distorts parallelism. "that is ......... than morphine is" maintains the parallelism. Hence, E is the answer.