With no explanation, chose the best option from "A" or "B". Kenny is at home with his little brother Liam and is trying to figure out something to do. Kenny wants to play a prank on Liam.

A: Kenny ties a piece of string to a 5 dollar bill and dangles it in front of Liam moving it each time Liam tries to pick it up.
B: Kenny hides around a corner as Liam is walking around the living room and then leaps out and screams in Liam's face.
A.