What does the phrase like lambs to slaughter suggest?
the slugs waited patiently for death.
the slugs had been long dead.
the slugs were actively trying to escape.
the slugs violently fought each other to live.

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.