2. Why is Katniss responsible for taking care of her family?

Because her dad died.

Explanation:

Her dad died on the cole mines and her mom fell into a deep depression. If it wasn't for Katniss her little sister Prim and her mom would've starved.

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.