Which Study Illustrates a Nonexperimental Study

Which study illustrates a nonexperimental study?

A) ​a study comparing self-esteem scores for children with a learning disability versusscores for children without a learning disability
B) ​a study comparing depression scores for one group that is assigned to receive a therapy versus another group that is assigned not to receive a therapy
C) a study comparing performance in a room where the walls have been painted yellow versus performance in a room painted blue
D) ​a study comparing cognitive functioning scores for one group of Alzheimer's patients who are assigned to receive memory therapy versus another group that is assigned not to receive therapy

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