Jamboree Question of the Day - Day 52, Dec 31st 2010

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

Solution (Posted on Jan 1st): 

A,B,C) are ..able to be modified - wordy

D) antibiotics - plural; a drug - singular

E) can be modified - concise ; CORRECT