Tim is conducting naturalistic observation. He finds that the behavior of his subjects changes when they notice his presence. Which statement best describes this situation?
a. The situation is good since the manipulation of the independent variable was successful.
b. The situation is good since that was the focus of the study.
c. The situation is not good since Tim did not record his subjects' behavior.
d. The situation is not good since Tim's behavior interfered with his subjects.
D
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