The following diagrams are supposed to represent hypothetical galaxies seen edge-on. The left diagram is a diagram without dark matter, while the right diagram shows a galaxy with a dark matter halo. Consider the force of gravity on the stars shown in the figures ( which you can assume all have the same mass):

    A ) Star A should be moving faster than star B because it is experiencing a stronger force of gravity
    B) Star B should be moving faster than star A because it is experiencing a stronger force of gravity
    C) Both stars A and B should be moving at the same speed
    D) You can't tell from the information given which star is moving faster

When called for, hold up the letter of your choice.