单选题：下列程序的运行结果是

下列程序的运行结果是 @[C](2)
```c++
#include
int main (void)
{
int a, b, c;
a = 20; b = 30; c = 10;
if (a < b)a = b;
if (a >= b)b = c; c = a;
printf("a=%d, b=%d, c=%d\n", a, b, c);
return 0;
}
```
A. a=20, b=10, c=20
B. a=30, b=10, c=20
C. a=30, b=10, c=30
D. a=20, b=10, c=30





A.a=20, b=10, c=20
B.a=30, b=10, c=20
C.a=30, b=10, c=30
D.a=20, b=10, c=30


答案：C