Galaxies Seem to Be Made Mostly of Dark Matter

Multiple Choice

Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of

A) the redshift in the light from the explosions of distant supernovas.
B) the redshift in the light from the earliest galaxies in the universe.
C) Both of the above.
D) the speeds at which gas clouds orbit the centers of galaxies.
E) distant quasars.