Psychologists have identified several weaknesses in people's ability to form accurate judgments regarding probabilities. One of those : a. Intuitive probability estimates tend to be lower than the objective probabilities, particularly for complex events. b. People's intuitive probability estimates are unstable and move up and down unsystematically, making them an unreliable basis for judgment c. People's intuitive estimates of the probability of an event is a function of how easily they can think of one or more examples of that type of event d. People tend to overestimate the probability of unpleasant or dangerous events, particularly with respect to very infrequent events