Which of the following, if true, would most discredit the new theory as described in the passage? A. The exact mechanism by which a star becomes a supernova is not yet completely known and may even differ for different stars. B. Chains of star-forming regions like those postulated in the new theory have been observed in the vicinity of dense clouds of gas and dust. C. The most massive stars formed from supernova explosions are unlikely to evolve into supernovas. D. Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion. E. A density wave cannot compress clouds of gas and dust to a density high enough to create a star.