What is the conjunction fallacy related to in decision making?

The conjunction fallacy is a cognitive bias where people tend to judge the probability of a conjunction of two events as more likely than the probability of one of those events occurring independently. When making decisions, individuals often overestimate the likelihood of complex or detailed scenarios, believing that having more specific information makes those scenarios more probable.

In the context of the given options, the correct choice relates directly to this phenomenon. When people encounter detailed events or specific circumstances, they may intuitively feel these descriptions must be more probable or plausible, even though the rules of probability dictate that the combination of events (the conjunction) can never be more likely than either of the events occurring on their own.

Choosing a detailed scenario over a more general one can lead to skewed judgments in probability assessments, demonstrating the conjunction fallacy at work. This affects decision-making by pushing people towards less rational conclusions based on detail rather than statistical reality.