The Fact That Quasars Can Be Detected from Distances Where

The fact that quasars can be detected from distances where even the biggest and most luminous galaxies cannot be seen means that they

A) must be intrinsically far more luminous than the brightest galaxies.
B) must be in directions where intergalactic absorption by dark matter is minimal,allowing us to see them.
C) must be in directions where gravitational focusing by the masses of nearer galaxies makes them visible from Earth.
D) have not been as redshifted by their motion as have galaxies,and hence they can still be seen.