One Hazard of Using Random Assignment and Controlling Extraneous Variables

Multiple Choice

One hazard of using random assignment and controlling extraneous variables in an experiment is that

A) debriefing becomes very cumbersome.
B) it is difficult to obtain informed consent from the participants.
C) participants often become angry at the deception involved.
D) the experimental situation can become quite artificial.
E) it is difficult to draw general conclusions.