What is a collapsar?
A) the name given to any massive star that collapses to form a white dwarf, neutron star, or black hole
B) a system in which a very massive star collapses to form a black hole surrounded by an accretion disk and jets that beam intense gamma-ray radiation
C) any gamma-ray burster
D) the bright flash of light that signals the merger of a black hole and its companion star
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