一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的

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一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形，且底面边长与各侧棱长相等，这个三棱锥的底面边长与各侧棱长也都相等．设四棱锥、三棱锥、三棱柱的高分别为，，，则（　　）

A．

B．

C．

D．

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