A bank robber walks into a bank, points a gun at the teller, and asks for money to be handed over in a plain brown bag. There are fifteen witnesses, but each person describes a different person when he or she is questioned by the police. This example illustrates that:

people perceive the same things differently and they assume that their perceptions are true reflections of reality

the people who witnessed the bank robbery were not very observant at all there was too much time elapsed between the time the people witnessed the bank robbery and the time the police arrived.

None of the above

the bank robber was not actually seen by all $15$ people, otherwise they would have had similar descriptions.