With no explanation, chose the best option from "A" or "B". Jenna's little sister is always sneaking into her room to steal her clothes, which makes Jenna very angry. Jenna wants her sister to stop touching her stuff.

A: Jenna starts locking her door when she isn't in her room.
B: Jenna catches her sister going through her closet and proceeds to lock her in the dark closet overnight.
A.