One of the Major Lessons Learned in the Chapter on Experiments

Multiple Choice

One of the major lessons learned in the chapter on experiments and quasi-experiments

A) is that there are almost no true experiments in economics and that quasi-experiments are a poor substitute.
B) you should always use TSLS when estimating causal effects in quasi-experiments.
C) populations are always homogeneous.
D) is that the insights of experimental methods can be applied to quasi-experiments, in which special circumstances make it seem "as if" randomization has occurred.