Spiral Galaxies Tend to Resemble a Pinwheel Because___________

Spiral galaxies tend to resemble a pinwheel because___________ .

A) stars in the center of galaxy are moving more slowly than the ones on the outer edges
B) stars are moving from the center to the edges of the galaxy
C) stars in the center of the galaxy are moving faster than the ones on the outer edges
D) the barred structures form twisted pathways that distort the flow patterns
E) the stars in the center are very old and large while the outer edges of the galaxy contain the youngest and smallest stars