Conceptos básicos de herencia y polimorfismo

Inheritance, ¿Que salida da el siguiente código? ¿What is the result of executing the following code?

using System;
namespace BasicTest
{
    public class A
    {
        public virtual void DoSomething()
        {
            Console.WriteLine("A doSomething");
        }
    }

    public class B:A
    {
        public void DoSomething()
        {
            Console.WriteLine("B doSomething");
        }
    }

    public class C : A
    {
        public override void DoSomething()
        {
            Console.WriteLine("C doSomething");
        }
    }

    public class D : C
    {
        public new void DoSomething()
        {
            Console.WriteLine("D doSomething");
        }
    }
    public class EntryPoint
    {
        static void Main()
        {
            A testB = new B();
            A testC = new C();
            A testD = new D();
            testB.DoSomething();
            testC.DoSomething();
            testD.DoSomething();
            Console.ReadLine();
        }
    }
}

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