When Astronomers Say That the Groups of Galaxies Are Distributed

When astronomers say that the groups of galaxies are distributed isotropically, they mean that

A) all the galaxies are about the same size
B) the way galaxies are arranged in space looks the same in all directions
C) galaxies all have interstellar matter at the same temperature
D) galaxies all have the same age
E) galaxies all contain the same isotopes of elements