It was the belief Alex Haley could find his root in Africa made him decide to go to Zambia．
A． /, which B．which, that C that ,which D．that , that
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解析：考查复杂句：第一个that引导同位语从句，第二个that是强调句中的，符合这样的结构：It is +被强调部分+that +其它部分 。句意：就是Alex Haley能在非洲找到他的根的想法使他决定去赞比亚。选D。