Which sentence from the passage best illustrates hardins central argument

Hardin believes overpopulation and the misuse of the world's resources are creating an unhealthy balance between the rich and  poor.

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.