Bjorn's wife walks into the family room while he is watching the tv and begins to tell him what she found out at the pta meeting. bjorn turns off the tv and directs his attention to his wife. which barrier to effective listening has bjorn addressed?

Distraction.

In order to effectively listen to another person when they are speaking to you all other distractions should be eliminated so your complete focus and attention is on the person speaking and nothing else. In this case the distraction was the tv. By switching it off Bjorn has eliminated the barrier to effective listening.