答案及解析：[单选题]已定义一个圆的类Circle: class Circle { private: double r; public: void SetR(double x) { r = x; } double GetA

问题：

[单选题]已定义一个圆的类Circle: class Circle { private: double r; public: void SetR(double x) { r = x; } double GetArea( ) { return 3.14*r*r; } }; 下列语句中正确的是( )。
ACircle c, *p = &c; p.SetR(10.5); p.GetArea( );
BCircle c, *p = c; p->SetR(10.5); p->GetArea( );
CCircle c, *p = &c; p->SetR(10.5); p->GetArea( );
DCircle c, *p = &c; p->GetArea( );