【正确答案】 D

【答案解析】[解析]A选项通过第三段第三句中 if the term can be applied to peoples without a script 可以排除。B选项不是原始的部落中的习俗。C选项文中没有提及。通过第二段最后一句“Among tribal people all knowledge inherited by tradition is shared by all；it is taught to every member of the tribe so that in this respect every body is equipped for life．”及第三段二、三句中 if the term can be applied to peoples without a script 可以推断出D是正确的选项。