SC-5

[mankey]

There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually able to be modified to make them a more effective drug.

(A) are usually able to be modified to make them a more effective drug
(B) are usually able to be modified to make them more effective drugs
(C) are usually able to be modified, which makes them more effective drugs
(D) can usually be modified to make them a more effective drug
(E) can usually be modified to make them more effective drugs

My answer is E. Please provide OA.

Regards
Mankey

[saketk]

There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually able to be modified to make them a more effective drug.

(A) are usually able to be modified to make them a more effective drug
(B) are usually able to be modified to make them more effective drugs
(C) are usually able to be modified, which makes them more effective drugs
(D) can usually be modified to make them a more effective drug
(E) can usually be modified to make them more effective drugs

My answer is E. Please provide OA.

Regards
Mankey

Yes -- passive voice -- use can instead of 'able to be'

Correct answer E

[mad2011]

Don't know grammar rules but ably to be sounds horrible to me.
ABC gone
plural so "a" is not Required

[gunjan1208]

+1 for E again.

[GmatKiss]

IMO:E