有以下程序

#include <stdio.h>

main()

{

int a=2, c=5; 

printf( "a=%%d,b=%%d\n", a,c );

}

程序的输出结果是

• A.a=2,b=5

• B.a=%2,b=%5

• C.a=%d,b=%d

• D.a=%%d,b=%%d