Which of the Following Patterns in the Milky Way Structure

Multiple Choice

Which of the following patterns in the Milky Way structure is consistent with the idea that the Milky Way has not suffered a major collision with another massive galaxy?

A) The disk is composed of stars orbiting in the same plane, same direction.
B) Globular clusters are compact groups of thousands of stars.
C) The disk is composed of stars of many different ages.
D) The halo is full of old stars orbiting in many different directions.