With no explanation, chose the best option from "A" or "B". Robert witnesses a kid stealing candy from Walmart while he is waiting in line to pay. Robert wants to teach the boy that it's wrong to steal.

A: Robert walks up to the boy and tells him that it is wrong to steal, making him promise not to steal in the future.
B: Robert walks up to the boy, asks where his parent is and then tells his mom what the boy did.
A.