If the Sun Were Traveling Around the Galactic Center Along

If the Sun were traveling around the galactic center along with companion stars (all in circular orbits) as depicted in Figure 16-19 from the text, from which of these stars would one measure the largest Doppler shift of their light?

A) stars at the same orbital distance as the Sun
B) stars in directions 45° from the Sun's direction of motion
C) All the companion stars are moving along with the Sun and have no relative velocity with respect to it.
D) stars directly between the Sun and the galactic center