Question

Monica spanks her 3-year-old daughter as a punishment for undesirable behaviors.

Answer 1

Her daughter may show higher levels of aggressive behavior.

Their is many many mental health studies to show that spanking/ physically punishing a child does more harm than good. - An actual Psychology Student :)

Answer 2

Is there any information to back this up? Like how do the non-spanked peers behave?

Based on the lack of information I'd say it's A or B.

A, because if the non-spanked peers are well behaved she might want to be more obedient to avoid spankings like them.

B, because she might find it unfair that she is the only one in her class or group of peers who receives spankings.

I don't think it would be c or d.