单项选择题有如下程序:#include<iostream>using namespace std;class Point{int x,y;public:Point(int x1=0,int y1=0):x(x1),y(y1){}int get(){return x+y;)};class Circle{Point cente;int radius;public:Circle(int cx,int cy,int r):center(cx,cy),radius(r){}int get(){return center.get()+radius;}};int main(){Circle c(3,4,5);cout<<c.get()<<endl;return 0;}运行时的输出结果是______。
A.5
B.7
C.9
D.12