The Reason That Researchers Cannot Allow Participants to Decide Whether

Multiple Choice

The reason that researchers cannot allow participants to decide whether to be in the control or treatment group is that this procedure may result in differences between the treatment and control group participants that

A) have nothing to do with the independent variable.
B) are a direct result of the independent variable.
C) have nothing to do with the dependent variable.
D) are a direct result of the dependent variable.