Combine into one sentence-
my parents gave me a car. that is why i'm able to afford to go to college. still, i work part-time. i work at wal-mart. i'm a cashier.

My parents gave me a car which is why I'm able to afford to go to college, I still work part-time at Wal-Mart, I work as a cashier

My parents gave me a car, which is why I'm able to afford to go to college; I work part-time at Wal-Mart, and I am a cashier.

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.

a. the man as a ruler