Which of the following statements about psychological experiments is MOST accurate?
A. The purpose of a single-blind experiment is to guarantee that neither the participants nor the experimenter influence the results.
B.The participant's expectations about an experiment do not influence results.
C.The placebo effect describes a change in a patient's illness or physical state that results solely from the medication administered.
D.Both the experimenter's expectations and the participant's expectations can influence the results of an experiment.
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