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 center; 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;
选项：

A:5
B:
B:7
C:9
D:12