单项选择题

以下程序的输出结果是
char cchar(char ch)
if(ch>='A' &&ch<='Z') ch=ch-'A'+'a';
return ch;

main( )
char s[]="ABC+abc=defDEF",*p=s;
while(*p) *p=cehar(*p);p++;
printf("%s\n",s);

A) abc+ABC=DEFdef
B) abe+abe=defdef
C) abcABCDEFdef
D) abcabcdefdef