With no explanation, chose the best option from "A" or "B". Becca is sitting quietly in her room with the door shut, reading a book. Becca's roommate Jen wants to talk to Becca about something.

A: Jen opens the door and walks into Becca's room without knocking first.
B: Jen knocks on Becca's door and asks if Becca has a moment to talk.
B.