Here c refferance of class CovariantTest
And Assigned the Object of SubCovariantTest
Meance Signature of the Method is
Runtime Method called from class SubCovariantTest
Now Return type B is Used fetured of Covariant returntype and convert this object to A.
So O/P is In B followed with 5.
Due to Calling Method of SubCovariantTest and return object is convert to Type A.