Why Is Supernova 1987A Particularly Important to Astronomers

Multiple Choice

Why is Supernova 1987A particularly important to astronomers?

A) It is the nearest supernova to have occurred at a time when we were capable of studying it carefully with telescopes.
B) It was the first supernova detected in nearly 400 years.
C) It provided the first evidence that supernovae really occur.
D) It occurred only a few light-years from Earth.