With no explanation, chose the best option from "A" or "B". David is overprotective of his teenage daughter, and he fears that she is too naive. David wants to make sure his daughter won't let someone take advantage of her.

A: David has a serious conversation with his daughter, explaining to her that she needs to be very careful when dealing with guys.
B: David makes a fake online profile, using the pictures of an attractive guy and starts messaging his daughter to see how she'll react.
A.