ASam Cannot Figure Out Why He Can't Get Sound from His

Multiple Choice

aSam cannot figure out why he can't get sound from his tablet's internal speakers and calls you asking for advice. You ask him to check to see if anything is stuck in the aux port. Sam assures you nothing is in the aux port. He also checks to make sure the sound is not muted.
What might prevent Sam from getting sound from his tablet?

A) Tablet is in airplane mode.
B) Multiple apps are sending audio to the speakers.
C) The audio output is being directed to a Bluetooth speaker.
D) The battery needs to be charged.