One difficulty of conducting research in the laboratory setting is that:
A) the setting is unnatural.
B) random assignment is impossible.
C) extraneous factors are difficult to control.
D) participants tend to be unaware that they are in an experiment.
Answer: A
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.