The correct answer is C. Acknowledges the existence of opposing viewpoints
Step-by-step explanation:
A persuasive text is a type of text written to convince the reader about a certain belief or opposition that the author supports using arguments and evidence but that is the only one included in the text. On the other hand, an argumentative text as a persuasive text aims at proving a certain position, idea or belief, but different to this it commonly acknowledges other points of view even those that contradict the idea that is being defended. Therefore, the characteristic that makes an argumentative text different from a persuasive one is that it "acknowledges the existence of opposing viewpoints".