More Supernovae Have Been Recorded, on Average, in Distant Galaxies

More supernovae have been recorded, on average, in distant galaxies than in the Milky Way Galaxy. Why is this?

A) The Milky Way is a relatively small galaxy, so we would expect fewer supernovae.
B) We can only view our own galaxy's central plane from within that plane, where dust obscures our view. We view other galaxies from a variety of orientations, not just along the central plane.
C) The Milky Way is a particularly old galaxy, and the production rate of supernovae has decreased.
D) Much of the radiation emitted from supernovae is not visible. The radiation from other galaxies, however, is often Doppler shifted into the visible, where it is more easily detected.