Object Diagram


I have some questions regarding constructing of an object diagram. In my case I have a class diagram I’m building it from. The system is built up by two abstract classes where class b inherits from class a and then the most minor subclass class c which only has a constructor inherits from class b. So far I have only seen attributes and its values to be depicted in an object diagram, not methods, and not constructors. Does this mean the only information to be given in an object diagram here would be a name for class C? Or what information should an instance of C be depicted with?

It does have the constructor which give values to two variables (in class a), and it also inherits two methods from class b. Should the inherited attributes be depicted, should methods be depicted?