Answer:
Disturbances known as noise
Explanation:
From the given scenario of the question ,
Bradley is not able to concentrate on the advertisement , as his friends are discussing about the TV program .
As the other people are continuously discussing about something else , so Bradley is not able to concentrate on the commercial break .
His friends acts as a disturbance or noise , which act as a barrier .
Hence , from the given scenario of the question ,
The correct answer is Disturbances known as noise .
