Which of the following BEST describes an outcome of using random assignment in experimental designs?
a. Random assignment guards against intersubject biases which may impact the measurement of the dependent variable.
b. Random assignment guards against experimenter effects because the research assistants are unaware of participants' group assignments.
c. Random assignment guards against selection biases because participants cannot self-select exposure to the treatment group.
d. Random assignment guards against demoralization of the control group.
Answer c
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