有类Person定义如下：public class Person {String name;int age ;void show() {System.out.print (name+" " +age+" ");}}以下操作的结果是：Person p = new Person();p.show();p = new Person();p.name = "Alice";p.age = 12;p.show();

A. null 0 null 0
B. null 0 Alice 12
C. Alice 12 Alice 12
D. Alice 12 null 0