How has artist joseph kosuth raised questions about the nature of art in his composition one and three chairs?

In your question which states and ask to find how has the artist Joseph Kosuth raised question about the nature of art in his composition One and Three Chairs, base on that, I would say that it problematize the relations between object, visual and verbal references plus semantic fields of the term chosen for the verbal reference

Opposition of two melodic ideas is the  right answer