Question ID:PT63 S1 Q2 Passage:Jocko, a chimpanzee, was once given a large bunch of bananas by a zookeeper after the more dominant members of the chimpanzee's troop had wandered off. In his excitement, Jocko uttered some loud "food barks." The other chimpanzees returned and took the bananas away. The next day, Jocko was again found alone and was given a single banana. This time, however, he kept silent. The zookeeper concluded that Jocko's silence was a stratagem to keep the other chimpanzees from his food. Stem:Which one of the following, if true, most seriously calls into question the zookeeper's conclusion? Correct Answer Choice:BChoice A:Chimpanzees utter food barks only when their favorite foods are available. Choice B:Chimpanzees utter food barks only when they encounter a sizable quantity of food. Choice C:Chimpanzees frequently take food from other chimpanzees merely to assert dominance. Choice D:Even when they are alone, chimpanzees often make noises that appear to be signals to other chimpanzees. Choice E:Bananas are a food for which all of the chimpanzees at the zoo show a decided preference.