单选题 It can be inferred from the passage that hypernovae are best at explaining which of the following questions faced by scientists?

• (A) What are the consequences of GHBs sweeping up the external medium that surrounds black holes?
• (B) What role does compact-star coalescence play in the GHB phenomenon?
• (C) How do normal-duration GHBs come into existence?
• (D) Of what does the matter leftover from the collapse of a star consist?
• (E) What sorts of GHBs are likely to be produced by the collapse of the Earth's sun?