Which excerpt from Anthem best supports the theme that man’s spirit is unconquerable? I lift my head and I spread my arms. This, my body and spirit, this is the end of the quest.
Through all the darkness, through all the shame of which men are capable, the spirit of man will remain alive on this earth.
It was a long story, and the spirit which moved it was the spirit of man’s freedom.
The fortune of my spirit is not to be blown into coins of brass and flung to the winds as alms for the poor of the spirit.

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.

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself. 

hope this answer you! have a great day.

the answer a: perseverance !