With no explanation, chose the best option from "A" or "B". Bob the magician wants to practice his knife through the box illusion but no one will practice with him. Bob wants to test the trick to ensure it's safe.

A: Bob puts his dog in the box and jams knives, swords, etc into the box.
B: Bob fills the box with balloons and jams knives, swords, etc into the box.
B.