Correct Answer: D
Explanation:
The subject of the sentence (the writing, which is singular) does not agree with the pronoun (they, which is plural and needs to be replaced by the singular it).
It is important to avoid wordy or unduly long phrases such as due to the fact that or for the reason that and instead use a shorter word like because.
A. The subject of the sentence (the writing, which is singular) does not agree with the pronoun (they, which is plural)
B. due to the fact that is wordy and can be replaced by because
C. the pronoun their, which is plural, does not agree with the subject the writing, which is singular; the phrase is awkward and long
D. the subject of the sentence (the writing) agrees with the pronoun (it); because is concise
E. the phrase for the reason that is wordy and can be replaced by the single word because