Answer:
b. disturbances known as noise.
Step-by-step explanation:
In the scenario given the question, Bradley can't focus on ads because his friends are discussing the TV program. Bradley is unable to focus on commercial breaks as others are constantly discussing something else.
Their friends act disturbingly or verbally, acting as a hindrance.
so that as scenario of the question,
The correct answer is b. disturbances known as noise.