GMAT Sentence Correction (SC) | Re: While some propose to combat widespread illegal copying of

I thought is was D. But, maybe this is the reason it's E.

15. While some propose to combat widespread illegal copying of computer programs by attempting to change people's attitudes toward pirating, others by suggesting reducing software prices to decrease the incentive for pirating, and still others by calling for the prosecution of those who copy software illegally.
(A) by suggesting reducing software prices to decrease the incentive for pirating, and still others by calling
(B) by suggesting
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