Which of These Would NOT Be Useful for Measuring the Mass

Which of these would NOT be useful for measuring the mass of the dark matter halo in a spiral galaxy?

A) Hα emission from H II regions in the spiral disk
B) the velocities of satellite dwarf galaxies surrounding a spiral galaxy
C) absorption lines in the spectra of its globular clusters
D) the velocities of star clusters in the outer disk
E) all of these can be used to measure the mass of the dark matter

Correct Answer:

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