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]};Void main(){P=aa;Printf("%d ", ++p->x);Printf("%d ", (++p)->x);Printf("%d ", ++(*p->y));}
选项：

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