It’s based on the idea all people are created equal, is accepted by most people.A. that

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A. that; that
B. which; which
C. which; when
(答案→)D. that; which
解析：考查同位语从句和非限制性定语从句：句意：它建立在所有的人生来平等这个观点的基础之上，这一观点被大多数人所接受。第一空用that引导同位语从句，解释中心词the idea的具体内容。该从句不缺少任何成分，所以用that来引导。第二空用which来引导非限制性定语从句，来修饰先行词the idea. which等同于the idea，在该非限制性定语从句中充当主语。选D。