Imagine You Discovered a Barred Spiral Galaxy That Was a "Milky

Imagine you discovered a barred spiral galaxy that was a "Milky Way twin" because the size of the bulge and disk, the arrangement of spiral arms, and other characteristics were just like those in our galaxy. Then you measured its rotation curve and plotted the figure shown below. What would you conclude about this galaxy?

A) This galaxy has much more dark matter than does the Milky Way.
B) This galaxy has about the same amount of dark matter as does the Milky Way.
C) This galaxy inexplicably has much less dark matter than does the Milky Way.
D) This galaxy probably has no stellar halo.
E) This galaxy probably has no central black hole.