Hello!
The answer is: a text that supports a claim about a debatable topic using evidence as support.
Why?
The argumentative text is used claiming about a point of view, or debatable topics. People use argumentative text every time they want to prove something, claiming that it's true (or not) by using proper evidence.
For example, in a trial, the accusing lawyers use the arguments in order to convince the judge that the accused is guilty, they do that exposing evidence that can prove their point.
Have a nice day!