Why this private method does get executed from another class?

I Created and implemented an interface explicitly as below.

public interface IA
{
    void Print();
}

public class C : IA
{
    void IA.Print()
    {
        Console.WriteLine("Print method invoked");
    }
}

and Then executed following Main method

public class Program
{
    public static void Main()
    {
        IA c = new C();
        C c1 = new C();
        foreach (var methodInfo in c.GetType().GetMethods(BindingFlags.NonPublic | BindingFlags.Instance))
        {
            if (methodInfo.Name == "ConsoleApplication1.IA.Print")
            {
                if (methodInfo.IsPrivate)
                {
                    Console.WriteLine("Print method is private");
                }
            }
        }

        c.Print();
    }
}

and the result I got on console is:

Print method is private

Print method invoked

So my question is why this private method got executed from other class?

As far as I understand the accessibility of private member is restricted to its declaring type then why does it behave so strangely.