单选题 Why do some philosophers hold the view that animals cannot have rights?

A、 Because the idea of punishing a tiger that kills somebody is absurd.
B、 Because it denies fights not only to animals but also to some people.
C、 Because people are always objected to social contracts.
D、 Because rights exist only within a social contract, as part of an exchange of duties and entitlements.

【正确答案】 D

【答案解析】[试题分析] 本题为细节题。
[详细解答] 问为什么有些哲学家认为动物没有权利：短文第二段第二、三句说，一些哲学家论证说，权利只存在社会契约中，是责任与权利相互交换的一部分。因此动物没有权利。D项与该信息一致，敖为正确选项。A项论据不充分，B和C是反面论据。