give the region

Question

1. using System;
2. namespace Polymorphism
3. {
4. class A
5. {
6. public void Test() { Console.WriteLine("A::Test()"); }
7. }
9. class B : A
10. {
11. public new virtual void Test() { Console.WriteLine("B::Test()"); }
12. }
14. class C : B
15. {
16. public override void Test() { Console.WriteLine("C::Test()"); }
17. }
19. class Program
20. {
21. static void Main(string[] args)
22. {
24. A a = new A();
25. B b = new B();
26. C c = new C();
28. a.Test(); // output --> "A::Test()"
29. b.Test(); // output --> "B::Test()"
30. c.Test(); // output --> "C::Test()"
32. a = new B();
33. a.Test(); // output --> "A::Test()"
35. b = new C();
36. b.Test(); // output --> "C::Test()"
38. Console.ReadKey();
39. }
40. }
41. }

please give the logical answer.

why a.test() call  A class function and why b.test() call C class test() function .

please share only technical region.