A strong conclusion will restate the thesis statement and broaden the scope of the essay in four to six sentences. You should also have an effective last sentence in the essay so you can wrap it up on a high note.
I would choose options (A) providing facts and (D) using deductive reasoning. Since the deductive reasoning is based on premises (providing fact would be the action needed) for its operation. When we reason deductively, we use known facts to arrive at logical conclusions that we know are true.
