All of the following are barriers to effective communication except

All of the listed items are barriers to effective communication except the absence of noise.

When noise is absent, the channel is clear and the message passes without interference, which helps rather than hinders.

The distortion of information is a genuine barrier, since it twists the message away from its meaning.

Information overload is a barrier, because too much input overwhelms the receiver's capacity to process it.

Cognitive dissonance is a barrier, as clashing beliefs make a receiver resist an incoming message.

Only the removal of noise aids communication, which is why it is the exception.