Supernovae Are One of the Most Extreme Events in the Known

Multiple Choice

Supernovae are one of the most extreme events in the known universe. They are caused by

A) the implosion of a white dwarf, which has run out of all its fuel.
B) a supermassive supergiant star undergoing a massive nuclear chain reaction.
C) the collapse of a supermassive supergiant star.
D) any of the above