Which of the following, if true, most seriously weakens the critics' argument? A. Piers Plowman is one of Langland's major works, whereas House of Fame is a minor work of Chaucer's. B. House of Fame survives in only three manuscript copies, substantially fewer than the number of manuscript copies that exist of Piers Plowman. C. Because Piers Plowman became a well-known work in its day, it is likely that the similarities between it and House of Fame were detected by many of the people who read House of Famesoon after Chaucer wrote it. D. Many of the themes and structures of Piers Plowman are also found in Latin, Italian, French works with which Chaucer could well have been familiar. E. There is no evidence that Chaucer and Langland ever met or that they corresponded with each other about literary topics.