Sentence Correction

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 the reduction of software prices to decrease the incentive for pirating, and still others call
(C) suggest the reduction of software prices for decreasing the incentive for pirating, and still others call
(D) suggest the reduction of software prices to decrease the incentive for pirating, and still others by calling
(E) suggest reducing software prices to decrease the incentive for pirating, and still others are calling
OA is E

some suggest .... attempting should be parallel to others suggest reducing and E is the only option..

I am not sure about the last part of the sentence...

d is wrong, broken parallelism

suggest, by calling (not parallel)

the word "by" breaks parallelism in the sentence

e. correct
correct idiom suggest------to

suggest to ( idiom- memorize it)

correct parallelism

suggest (verb) reducing, are (verb) calling

This has been discussed before , just google it.

The correct sentence E is of the form While X,Y and Z where only X and Y need to be parallel