How does the structure of the dialogue differ from Montag's thoughts? What does this structural
difference reveal/emphasize? (Bradbury 22).

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.

this labor, by slow prudence to make mild.   c. ability to govern well

a simple sentence must have at least one dependent clause.

the answer is b to the question