Quasars Typically Appear to Be

Quasars typically appear to be

A) extremely massive objects in the Milky Way Galaxy, their spectra showing very high gravitational redshift.
B) moving away from Earth at very high speeds, up to about 90% of the speed of light.
C) moving across Earth's line of sight at very high speeds, as seen in time-lapse photographs.
D) moving toward Earth at high speeds, as high as 90% of the speed of light.