[Mrs. Auld] had bread for the hungry, clothes for the naked, and comfort for every mourner that came within her reach. Slavery soon proved its ability to divest her of these heavenly qualities. Under its influence, the tender heart became stone, and the lamblike disposition gave way to one of tiger-like fierceness. The first step in her downward course was in her ceasing to instruct me.
Here are the answers
A, Her inability to help the poor frustrates her.
B, She is sympathetic to the plight of enslaved persons.
C, Her attitude and behavior change as a slaveholder.
D, She is a strict teacher who does not forgive students.
I'm pretty sure C is the answer since in the passage it says "Slavery soon proved its ability to divest her of these heavenly qualities. Under its influence, the tender heart became stone.." Which shows after slavery her attidude chanhes from being nice and giving to cold and cruel.