What does it mean to cite textual evidence and how
does evidence help an argument?

Show where you found your evidence

Explanation:

Show where you found your evidence at and how does your evidence help in argument. Like who was the first president of the United States. You looked it up, find you evidence to help you in argument, and explain where you got that evidence. Makes a little sense?

since it is asking for her reaction to elnora's trouble at school you can rule out any answers with a positive response (b). then you can rule out (d), this is because it does not show the mother's reaction but the daughter's response. that leaves you with two options (a) and (c), by looking at the options you can rule out (c) because it isn't referring back to elnora's issues at school.