Students Were Amazed When Professor Diaz Walked into Class on the First

Multiple Choice

Students were amazed when Professor Diaz walked into class on the first day of the semester and correctly "sensed" that two people in his class of 23 were born on the same day. The tendency to think that it is very unlikely that two people in a class of 23 could share the same birthday is an example of the:

A) belief-bias effect.
B) confirmation bias.
C) fallacy of positive instances.
D) overestimation effect.