The statement that best describes how the author develops the central idea that the Republic is the greatest of Plato's Dialogues is:
4. He first acknowledges a few aspects of other Dialogues that are superior, and then lists numerous ways in which Republic is superior.
This is evident as the author recognizes some qualities of other Dialogues, such as their approach to metaphysics, artistic excellence, and clarity in political structure, but then emphasizes the superior qualities of the Republic in terms of its comprehensive view, depth, irony, humor, and the integration of life and speculation.