单选题：How many times is the loop executed?

How many times is the loop executed? @[C](2)
```
int a=0;
while (a=0)
{
printf("%d",a);
a--;
}
return 0;
}
```
A. countless
B. 1
C. 0
D. Syntax error




A.countless
B.1
C.0
D.Syntax error


答案：C