Which is a common external barrier to effective communication?

A noisy environment is a common external barrier to effective communication because it physically interferes with the ability to hear and process spoken messages. When there is excess sound, whether from background chatter, machinery, or other disturbances, it can prevent both the sender and the receiver from focusing on the content being communicated. This distraction can lead to misunderstandings, loss of important information, and an overall breakdown of the communication process.

In contrast, while a speaker's accent, emotional state, and perceptual differences can impact communication, they are generally more related to individual interpretation and perception rather than external conditions. A noisy environment stands out as an external factor that universally applies to anyone involved in the communication process, making it a significant barrier to clarity and understanding.