Aaliyah Lies in Her Bed at Night, Talking Out Loud

Aaliyah lies in her bed at night, talking out loud. Her parents listen from the hallway and hear her talking about her day as if she's talking to another person. What should her parents conclude about Aaliyah's behavior?

A) She's engaging in private speech, and it is completely normal.
B) She's engaging in private speech, and it is a sign of abnormal development.
C) She thinks there is someone else in the room.
D) Children who talk out loud when alone are usually experiencing bullying at school.