What do you need ? 13 reasons ???
The infinitive is a grammar term that refers to a basic verb form that often acts as a noun and is often preceded by the word "to.". "To sing" is an example of an infinitive
I think the author established anger as the mood in the excerpt. It is noticeable how the character is furious (for whatever reason) and shows her emotions by tearing that thin handkerchief into ribbons.
Hope this helps :)
The correct answer is "an underlying concept".
Themes are usually the most general underlying ideas in works of art and can be explored using various art forms.