15) if there were another heading in this article titled “former reality show contestants defend their choices,” one would expect this section to include information about

This headline indicates that the article would be about people who have been on reality shows talking about why they made the choices that they did. You could assume also that their choices were controversial or that the audience did not agree with them, because the word "defend" means they're trying to prove that they had a reason that felt right to them for making the choice they did. 

For what class is this

Abiography is a description of a real person's life, including factual details as well as stories from the person's life. biographies usually include information about the subject's personality and motivations, and other kinds of intimate details excluded in a general overview or profile of a person's life.