Robert was listening to the instructions provided by his boss. however, it was difficult to hear each step because caitlin and josh were engaged in a discussion close by. which barrier to effective listening is hindering robert's ability to listen to his boss?

Physical Distraction

Explanation:

Robert finds it difficult to hear his boss each instruction because of physical distractions created by Caitlin and Josh.  

Physical distraction can be created in many ways like

Thus any form of involvement between the two is considered a distraction and weakens their communication.

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