A.
#include void main(void){FILE *fp; fp=fopen("file1.c","WB"); }
B.
#include void main(void){FILE fp; fp=fopen("file1.c","w"); }
C.
#include void main(void){FILE *fp; fp=fopen("file1.c","w");}
D.
#include void main(void){FILE *fp; fp=fopen("file1.c","w"); }