A. An effective outline states whether reference sources are credible or biased.
Answer:
The statement that best describes an effective outline for an informative essay is D. An effective outline organizes the content into an introduction, body, and conclusion.
Explanation:
An outline for an essay refers to the essay plan. The outline is aimed at allowing the writer to have a solid structure he or she can build on, so a division between an introduction, body and conclusion would be very useful to organize the essay writing.