Which of the Following Statements Is an Example of Constructive

Which of the following statements is an example of constructive criticism?

A) Your argument will be stronger if you rewrite the introduction to include more details about the event.
B) There were three factual errors in the document you sent. You have been very careless of late.
C) Your meaning is unclear, you should rework the document for more clarity.
D) Your method of organizing information is inappropriate for the subject.
E) You need to improve your style of writing, it is not suited to the topic.