以下程序的输出结果是（)。using System; namespace aaa { public class Person { private int ag

以下程序的输出结果是()。using System; namespace aaa { public class Person { private int age = 0; public int Age { get { return age; } set { if (value＞=18) Console.WriteLine("成年人"); else Console.WriteLine("非成年人"); age = value; } } } public class People:Person { public People() { Console.Write("不得入内"); } } public class Program { public static void Main() { People Shang = new People(); Shang.Age=25; } } }

A、非成年人不得入内

B、成年人不得入内

C、不得入内非成年人

D、不得入内成年人