list and two classes

Question

public class A

{

public int x;

public int y;

public A(int x, int y)

{

this.x = x;

this.y = y;

}

public int Make()

{

return 1;

}

}

public class B : A

{

public int z;

public B(int x, int y, int z) : base(x, y)

{

this.z = z;

}

public int Make()

{

return 1;

}

}

class Program

{

static void Main(string[] args)

{

List<A> myA = new List<A>();

myA.Add(new A(1, 2));

myA.Add(new B(3, 4, 5));

Console.WriteLine(myA[0].Make());

Console.WriteLine(((B)myA[1]).Make());

for(int i = 0; i < 2; i++)

{

Console.WriteLine(myA[i].Make()); //how to send classB.make this element.

}