Answer:
An appeal based on the author’s character.
Explanation:
In these lines, we find that Anaya makes an appeal based on his own character. This device is also called ethos, and it is one of the most common modes of persuasion, along with logos and pathos. In the passage, the author tries to make his argument more persuasive by talking about his qualifications. He tells us that he has been writing for a quarter century, and has been a published author for eighteen years. He also states that he has been part of the Chicano movement.