有如下类的定义，下划线处的语句是( )。
class MyClass_______________ int x, y;
Public:
MyClass (int a=0,int b=0)x=a;
y=b;static void change()y-=10;
y-=10;;

A．MyClass operator * (double, double);
B．MyClass operator * (double, MyClass);
C．MyClass operator * (MyClass, double);
D．MyClass operator * (MyClass, MyClass);

A．队列
B．线性表
C．二叉树
D．栈