单选题：5-5. 下列程序的输出结果是

5-5. 下列程序的输出结果是 @[C](2)
```c++
#include

int fun3(int x) {
static int a = 3;
a += x;
return (a);
}

int main()
{
int k = 2, m = 1, n;
n = fun3(k); n = fun3(m);
printf("%d\n", n);
return 0;
}
```
A. 3
B. 4
C. 6
D. 9





A.3
B.4
C.6
D.9


答案：C