Use your head; nothing taught by others can have the same effect on you as learnedthrough

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A. those
B. what
(答案→)C. that
D. the one
解析：考查代词辨析。That指代可数名词单数或者不可数名词，后面必须要有定语修饰。The one指代可数名词单数，表示泛指。Those指代可数名词复数，后面必须有定语修饰。句意：用你头脑去思考，别人教的东西没有你自己通过练习学会知识有一样的效果。句中的that指代something，后面有定语learned through practice修饰。故C正确。