It was until ______ and ______ dynasties that the clay figurine had been substantially produced and became one of the main artworks in the mass's cultural life.

The author mentions Roy Lichtenstein and Alan Sonfist in line 14 in order to（） A: show that certain artist are famous mostly for their public art B: introduce the subject of unusual works of art C: demonstrate the diversity of artworks displayed in public D: contrast the cities of Miami Beach and New York