Which of the following is least true about social psychological experiments?
A) It is very difficult to have high internal validity and high external validity in a single experiment.
B) It is necessary in all experiments to randomly select participants from the population to which you want to generalize.
C) Even if an experiment is low in mundane realism, it should be high in psychological realism.
D) One experiment is limited in what it tells us; to generalize, it is necessary to replicate the study in different situations and with different types of participants.
E) The beauty of an experiment is that it can establish causality (whether one variable is causing another). To show this, however, the experiment sometimes has to be conducted in a somewhat unreal situation.