Sam Needs to Have His Car Serviced

Sam needs to have his car serviced. There is an auto repair shop located nearby that does a lot of business and has an online rating of 4 out of 5 stars. Sam takes his car to be serviced and thinks the service person is grumpy and that his car is still not running as well as it could be. Sam then makes a point of telling his friends not to use the repair shop. Sam's actions illustrate which of the following systematic mistakes that people make when making decisions?

A) People are overconfident.
B) People give too much weight to a small number of vivid observations.
C) People are reluctant to change their minds.
D) All of the above are correct.