请说出A类中System.out.println的输出结果。class B {int x = 100,y = 200;public void setX(int x) {x = x;}public void setY(int y) {this.y = y;}public int getXYSum() {return x+y;}}public class A {public static void main(String args[]) {B b = new B();b.setX(-100);b.setY(-200);System.out.println("sum="+b.getXYSum());}}

A. -300
B. 300
C. -100
D. -200