Tracie, working at a research facility in washingtond. c., needs to communicate with juan, who is in mexico city, about a project they are working on. although juan has perfect command of english, they are still facing a(n) barrier to communication.

Although Juan has perfect command of English, they are still facing a "physical" barrier to communication.

Physical barrier refers to the environmental and characteristic condition that go about as a boundary in correspondence in sending message from sender to collector. Authoritative condition or inside workspace plan issues, innovative issues and commotion are the parts of physical hindrances.  

Unsettling influence in hearing because of roars, phone call detachment, issues in TV gathering, message not being sent in visit, and so on are a few instances of physical barriers of communication.  

you want me to join your discord for points?