单选题：下面关于字符串的程序，其输出结果是

下面关于字符串的程序，其输出结果是 @[B](4)
```C++
#include

void fun(char s[], char t) {
int i = 0;
while (s[i]) {
if (s[i] == t)
s[i] = t - 'a' + 'A';
i++;
}
}
int main() {
char str[100] = "abcdefg", c = 'd';
fun(str, c);
printf("%s\n", str);
return 0;
}
```
A. abcdefg
B. abcDefg
C. ABCdEFG
D. ABCDEFG



A.abcdefg
B.abcDefg
C.ABCdEFG
D.ABCDEFG


答案：B