What is singular possessive, plural, and plural possessive of alumnus?

Read the excerpt from “take the tortillas out of your poetry.” i do not believe we should have to leave out the crucial elements of our language and culture to contribute to american literature, but, unfortunately, this is a conclusion i am forced to reach. i have been writing for a quarter century, and have been a published author for eighteen years. as a writer, i was part of the chicano movement which created a new literature in this country. which type of rhetoric is used most in the excerpt to convince readers that anaya’s conclusion is accurate? an appeal based on emotion an appeal based on logic an appeal based on the author’s character an appeal based on the author’s feelings