Answer:
Cocktail Party Effect
Explanation:
Cocktail party effect: In psychology, the term cocktail party effect is defined as a phenomenon in which the brain's capability of an individual to focus on his or her auditory attention is being determined related to a specific stimulus and hence involves the process of filtering out various other stimuli.
Example: An individual who is in a part can easily lead a conversation by his or her friend because of the cocktail party effect.
In the question above, the given scenario best illustrates the cocktail party effect.