What Are the Typical Features Seen in Quasar Absorption Lines

What are the typical features seen in quasar absorption lines of intergalactic clouds?

A) The hydrogen line is wider and lines from heavy elements are weaker at higher redshifts.
B) The hydrogen line is narrower and lines from heavy elements are weaker at higher redshifts.
C) The hydrogen line is wider and lines from heavy elements are stronger at higher redshifts.
D) The hydrogen line is narrower and lines from heavy elements are stronger at higher redshifts.
E) A few weak absorption lines are always seen at higher redshift than the quasar.

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