By Studying Distant Galaxies in the 1920s, Hubble Made the Following

By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding.

A) All galaxies were born at the same time, and all will die at the same time.
B) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going.
C) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.
D) All galaxies outside the Local Group are orbiting the Local Group.
E) All galaxies contain billions of stars, and all galaxies have spiral shapes.