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题目材料：

Which of the following is an assumption on which the scientists' hypothesis depends?

A.Goldbeaks are not the only species of bird in which individual males employ a multiplicity of song variants.
B.The variety of an individual male goldbeak's songs discourages other intruders besides competing male goldbeaks.
C.Other birds are less likely than male goldbeaks to have the ability to recognize whether two song variants have been sung by the same male goldbeak or two different male goldbeaks.
D.Male goldbeaks do not have distinctive individual voices that can be reliably recognized by other male goldbeaks.
E.Male goldbeaks trypically are able to control significantly arger territories than do most comparably-sized male birds of other species.

D显示答案

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以上解析由考满分老师提供。