题目内容

对于类A,B,C,D和接口 IA,IB,IC 有以下的定义，class A{}class B extends A implements IA{}class C extends B implements IB{}class D extends B implements IC{}interface IA{}interface IB extends IA{}interface IC extends IA{}A tmpA = new A()B tmpB = new B()C tmpC = new C()D tmpD = new D()则下列使用方法中正确的是()

A. tmpB = tmpA
B. tmpC =tmpD
C. tmpA = tmpC
D. tmpD = tmpB

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