When you are in the revision stage, you should correct your word choices. Option D is correct.
Revision does not refere to the improvement of grammar or diction. Those will be the focus of later editing.
Revision is the stage in the writing process where the author reviews, changes, and amends their message, in accordance to what has been written in the draft.
During a succesful revision the author should identificate the thesis, considerate the structure and uncover weakness in argument or presentation.
