若输入 "I am a boy!", 下列程序的运行结果为______。
char connect(string1,string2,string)
char string1[],string2[],string[];
int i,j;
for (i=0;stringl[i] !=’\0’;i++) string[i]=stringl[i];
for (j=0;string2[j] !=’\0’;j++) string[i+j]=string2[j];
string[i+j ] =’\0’;

main ( )
char s1 [100] , s2 [100] , s [100];
printf ("\n 输入 string1: \n");
scanf("%s",s1);
printf (" \n 输入 string2: \n" );
scanf ("%s", s2);
connect (s1, s2, s);
printf ("%s\n", s);

A．I am a boy!

B．输入string2:

C．I am

D．I am a boy!