What does to keep one’s treasure protected?

You would hide it somewhere where someone won't think to find it. For an example if it is money, you can hide it in a book.

Since Treasure infers something of the greatest importance,

something you would not want to lose, or have stolen, you should keep it in the most incredibly safe place. A Treasured memory of something very private might best be kept in the mind as a memory; a gift from that person or persons in your family, keep Between yourselves; something purely of monetary value, keep in the safest possible place where it cannot be found, or place it in the Bank in a Safety Deposit box. Unless it is simply a generic “treasure”, I think it matters what that Treasure is.

Explanation:

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.