A Writer Is Commenting on the First Draft of a Technical

A writer is commenting on the first draft of a technical report written by another team member. Which of the following comments is most appropriate?

A) "You've really improved your editing skills, Brian. Your writing would be less confusing if you used more active voice. And the report would be even better if you used some bulleted lists to break up some of your longer paragraphs."
B) "Section 3 does a great job of making a case for the importance of our usability testing. Perhaps we should also include a graph showing a decrease in customer-service calls since we started testing. We may also want to add a section on user feedback."
C) "I'm working on several different projects right now. I've been able to proof the document. However, I leave it to you to check its organization. Also, I feel you didn't sell me on the benefits of usability testing."
D) "Use Arial Bold for all headings. Change on-line to online. Delete section 4. Add a map of the site in section 2. Otherwise, you are on the right track. Good work, Kathy."