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While working together at the Jane Goodall Institute's Tchimpounga Chimpanzee Sanctuary in the Republic of Congo, cognition researchers Felix Warneken and Alexandra Rosati conducted an experiment comparing chimpanzees' decisions in two situations: a "raw-delay" condition and a "cooked-delay" condition. In the raw-delay condition, Warneken and Rosati offered the chimpanzees a choice between receiving a piece of raw food immediately and waiting for one minute to receive three pieces of raw food; the chimpanzees chose the larger, delayed reward 60 percent of the time. In the cooked-delay condition, in which the chimpanzees could receive one piece of raw food immediately or wait one minute for three pieces of cooked food, they chose the larger, delayed reward approximately 85 percent of the time.
Which choice most effectively introduces the main topic of the paragraph?
A.NO CHANGE
B.In a series of behavioral tests approved by Harvard University's Institutional Animal Care and Use Committee,
C.To determine whether chimpanzees are more likely to delay gratification for a cooked food reward than they are for a raw food reward,
D.As part of some fascinating work being conducted in the field of cognitive science,
