下列程序中那条语句有错误？class Tom{intx;staticint y;voidshowXY(){System.out.printf("%d,%d\n",x,y);}staticvoid showY(){System.out.printf("%d\n",y);}}public class E{publicstatic void main(String[] args){Tom.y=100;//ATomcat=new Tom();cat.x=100;cat.y=200;//BTom.x=300;//Ccat.showXY();Tom.showY();//D}}

A
B
C
D