Which of the Following Is a Limitation of the Ex

Multiple Choice

Which of the following is a limitation of the ex post facto design?

A) Participants who are exposed to the DV multiple times can become sensitized to the area under investigation.
B) Experimenter bias is a greater problem in ex post facto research compared with other research designs.
C) It is difficult to find natural pairs.
D) You cannot be certain that the IV is the only difference between groups.