How Are Clusters of Galaxies Spread Throughout the Universe

Multiple Choice

How are clusters of galaxies spread throughout the universe?

A) They are distributed more-or-less evenly (i.e. ,at random) throughout the universe.
B) They are distributed over the surfaces of large voids,making the universe look like a large collection of soap bubbles.
C) They are distributed with increasing density of galaxies toward some point,which must be the original site of the Big Bang.
D) They are distributed into long lines that cover the universe like a gigantic network of strings.