单选题：The output of this program is ( ).

The output of this program is ( ). @[D](2)
```
int func(int a,int b)
{return (a+b);}

main( )
{int x=2,y=5,z=8,r;
r=func(func(x,y),z);
printf(“%d\n”,r);
}
```
A. 12
B. 13
C. 14
D. 15




A.12
B.13
C.14
D.15


答案：D