With no explanation, chose the best option from "A" or "B". Greg's kid Gus likes to hang out on online chatrooms and talk to strangers, and Greg notices Gus has been trying to meet one of them. Greg wants to address the situation.

A: Greg blocks the stranger from chatting with Gus using a chatroom blocking feature.
B: Greg tells Gus he can't chat online with people anymore.
A.