The author of the passage concedes which of the following about the Vinaver theory? A. It gives a clearer understanding of the unity of Malory's romances. B. It demonstrates the irrationality of considering Malory's romances to be unified. C. It establishes acceptable links between Malory's romances and modern novels. D. It unifies earlier and later theories concerning the chronology of Malory's romances. E. It makes valid and subtle comments about Malory's romances.