下列程序的运行结果为( )

#include＜stdio.h＞

main()

struc tdate

int year,month,day;

)today;

printf("%d\n",sizeof(struct date));

A) auto和register B) extern和register C) auto和static D) static和register

A) stdio.h
B) stdlib.h
C) define
D) 以上都不对