Which of the Following Is a Reason to Be Cautious

Which of the following is a reason to be cautious about interpreting results from laboratory experiments in economics?

A) The experiments do not typically allow subjects to keep real money.
B) The typical subjects in the experiments may not be representative of the entire population.
C) The stakes are typically greater in experiments than in the real world.
D) Laboratory experiments cannot really be conducted in economics since it is a social science.