Sentence Correction

I would have chosen D and E...but now I see why E is a correct choice in the first sentence

For 1st question

E - maintaining parallelism - ...in which X and in which Y and in which Z

A - incorrect - violating parallelism - ... in which X, and Y, and Z.

B - incorrect - violating parallelism - ... in which X, where Y, and where Z.

C - incorrect - violating parallelism - ... in which X, for Y, and Z.

D - incorrect - violating parallelism - ... in which X, Y, for Z.

2nd Ques

D - incorrect - wrong tense became - Make use of present tense -> 1. to state facts 2. to discuss one's own ideas 3. to discuss the ideas expressed by an author in a given work

Answer
Option A.
'the press cooperated in maintaining the distinction, and '
This is the correct answer
Option B.
the press cooperated in maintaining the distinction, and where.
Option B is similar to option A but the use of 'where' makes it incorrect and unsuitable to be the answer.
The use of 'where' does not compliment the preceding sentence
Option C
'the press cooperated to maintain the distinction, and'
not 'to maintain' but 'to maintain'
Option D.
'the press cooperated to maintain the distinction, for'
incorrect sentence usage 'to maintaining' not 'to maintan'
Option E.
in which the press cooperated in maintaing the distinction, and in which
improper word usage maintaing not maintaing