请阅读下面的程序代码,选择正确的运行结果()Class Person{void say(){System.out.println(“hello”);}}class Example{public static void main(String[] args){Person p1 = new Person();Person p2 = new Person();p1.say();p2.say();p2=null;p2.say();}}

A. 输出1个hello
B. 输出2个hello后会抛出异常
C. 输出3个hello后会抛出异常
D. 不会输出hello,直接抛出异常