All of the following items are expressed in the subjunctive except

a wish
a condition contrary to fact
a that clause expressing necessity
a statement of fact

b. his ability to use formal language to stress strong feelings

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.