Question

the human brain can be thought of as having two different modes. daniel kahneman, an influential psychologist, labels one the \fast\ mode of thinking and the other the \slow\ mode. in the fast mode, according to kahneman, we make decisions using our intuitions and emotions. the sight of a spider may activate the fast mode and lead a person to scream. the same persons slow mode might decide (after a moment) that the spider is not actually a threat. in the slow mode, we make decisions using reason and logic. the slow mode is helpful in complex situations where the right choice is not always clear. however, because the slow mode uses more mental resources than the fast mode, our brains cant rely on it all the time. the instincts that drive the fast mode of thinking save us a great deal of time and energy. the main, or central, idea of the passage is the \fast\ mode of thinking is helpful for reacting quickly, while the \slow\ mode is helpful for analyzing complex situations. how does the detail in bold develop the main idea? it describes a similarity between the slow and fast modes of thinking. it illustrates the slow mode using a specific example. it identifies a disadvantage of the slow mode of thinking.

Explanation:

The passage first states the main idea about fast - and slow - thinking modes. Then it gives an example of seeing a spider. The fast mode makes one scream, and the slow mode makes one realize the spider is not a threat. This is an example of the slow mode in action.

Answer:

It illustrates the slow mode using a specific example.