The Extreme Redshifts of Quasar Spectra Are Caused by

The extreme redshifts of quasar spectra are caused by

A) very high recession speeds of the sources away from the Milky Way Galaxy.
B) absorption of all but the red parts of the quasar spectrum by intergalactic matter.
C) Zeeman effects from the very intense magnetic fields in the vicinity of the source.
D) high gravitational fields at the surfaces of the quasars (gravitational redshift) .