What describes the cocktail party effect?

The correct answer is B. The cocktail party effect refers to the phenomenon where individuals can focus their auditory attention on a single conversation in a noisy environment, such as a party with many conversations happening simultaneously. This ability allows people to selectively listen to one voice while filtering out the rest of the background noise. It is an example of selective attention and demonstrates the brain's ability to prioritize and process relevant information while ignoring distractions.