单选题：执行下面的程序后变量a的值是

执行下面的程序后变量a的值是 @[A](2)
```c++
#include
int main(void)
{
int a, b;
for (a = 1, b = 1; a <= 100; a++) {
if (b > 10)break;
if (b % 3 == 1) {
b += 3;
continue;
}
b -= 3;
}
printf("%d\n", a);
return 0;
}
```
A. 5
B. 6
C. 7
D. 8




A.5
B.6
C.7
D.8


答案：A