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Help with Psychology Homework work? URGENT?

I have to do test corrections and I don't understand what the correct answer is. Can you please explain to me. The answer sheet says that 'D' is correct. Thanks.

25. When informed that a brief imperceptible message would be flashed repeatedly during a popular TV program, many viewers reported feeling strangely hungry or thirsty during the show. Since the imperceptible message had nothing to do with hunger or thirst, viewers' strange reactions best illustrate
a.the McGurk effect.
b.sensory adaptation.
c. the volley principle.
d.a placebo effect.
e.accommodation.

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