How Do We Know That There Are Intergalactic Clouds Between

How do we know that there are intergalactic clouds between a distant quasar and us?

A) We see hydrogen emission lines at redshifts smaller than that of the quasar.
B) We see hydrogen absorption lines at redshifts smaller than that of the quasar.
C) We see hydrogen emission lines at redshifts greater than that of the quasar.
D) We see hydrogen absorption lines at redshifts greater than that of the quasar.
E) We see that the emission lines from the quasar are lessened by intervening gas and dust.

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