Tracie, working at a research facility in washington, dc, 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.

physical barrier of communication

Explanation:

Physical barrier of communication -

It is the type of restriction between the communication between two people is referred to as  physical barrier of communication .

This type of restriction causes lack of information exchange , which could be due to many reasons , like no common language of communication .

Hence, from the given scenario of the question, the correct term is physical barrier of communication .

the answer is either c or d i think its d