The answer is b to let her know that he was ok
Precisely the author keeps the interest of readers not describing clearly the kind of relationship in Giselle's family. By doing this, readers had to imagine and assume how it was. Instead, the author described better scenes with Dark Star and the influence of books about horses in Giselle's life and actions. Also the fact that she broke her arm but not referring to it in detail leads the readers to imagine and guess what could have occurred.
A villain is an example of an archetype. The Incredibles, the character in question Syndrome. He's there to create the major conflict with the protagonist's the Incredible's family.
Allusion is a figure of speech, which someone refers directly or indirectly to an object or instance from a different story or such. For example, someone could say to another well known person,"Don't be a Hitler." They would be referencing a historical figure that had a bad influence.