Question ID:PT41 S1 Q8 Passage:Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air. Stem:Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above? Correct Answer Choice:DChoice A:By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching. Choice B:Different land-based predators are responsible for different numbers of vervet monkey deaths. Choice C:No predators that pose a danger to vervet monkeys can attack both from land and from the air. Choice D:Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage. Choice E:Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.