The answer is 3. Acknowledges the existence of opposing viewpoints
Explanation:
Both argumentative and persuasive texts aim at explaining and proving a position or point of view of the author about some topic or issue, by supporting the main argument with reasons and evidence. However, these texts are slightly different, in the case of persuasive texts, this aim at persuading or convincing the reader the viewpoint by the author is the only one that should be believed, but in the case of argumentative texts the author does not want to claim there is only one valid opinion and because of this, despite the author defends only one point of view he acknowledges there are alternative viewpoints to the one being defended. Thus, the feature that distinguishes an argumentative text form a persuasive one is that the last one recognizes opposing viewpoints.
