TOEFL Listening: ETS-TOEFL听力机经 - 43D4TG6HP3M3J133P$

What is the professor's opinion of the scrub jay studies? A. They reveal the mental processes scrub jays use to make decisions. B. They raise doubts about the Bischof-K hler hypothesis. C. Their results are not reliable. D. Their conclusions are not supported by the evidence.