下面程序的输出结果为（）。struct st{ int x;int *y;} *p;int dt4]={10,20,30,40};struct st aa4]={ 50,&dt0],60,&dt1],70,&dt2],80,&dt3] };main(){ p=aa;printf("%d\n", ++p->x );printf("%d\n", (++p)->x);printf("%d\n", ++( *p->y));}
选项：

A:10 20 20
B:50 20 20
C:51 60 21
D:60 70 31