Supernovae Are ____

Supernovae are ____.

A) very common: there are thousands of detectable events occurring in our galaxy each year
B) common: a few dozen are detected in our galaxy each year
C) uncommon: there are only one or two detected in our galaxy each year
D) rare: only one or two occur each century in our galaxy
E) extremely rare: only one or two are detected in the Universe each decade