Peter has always been shy, but he$$s trying to practice his presentation skills so that he can advance at work. Peter attends a class on effective communication skills, and the facilitator points out that Peter often crosses his arms in front of his chest when he speaks, which can make him appear $$closed off$$ or defensive. The facilitator is pointing out a potential $\_\_\_\_\_\_\_\_\_$ barrier to communication that Peter should be careful to avoid.

physical

perceptual

organizational

body language