Which Is One Reason That the Typical Galaxy's Mass-To-Light Ratio

Which is one reason that the typical galaxy's mass-to-light ratio (in units of the Sun's mass over the Sun's luminosity) generally greater than 1?

A) galaxies contain mostly stars much brighter than the Sun
B) galaxies contain mostly stars much more massive than the Sun
C) galaxies contain many more stars that shine much less brightly than the Sun
D) most of the mass in a galaxy is in the form of dust
E) this is an unsolved problem in astronomy; scientists have no clue

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