are composed of many stars. have a clockwise spin. are irregularly shaped. have the same number of stars.
I gave my students this multiple choice question: All galaxies in the universe

Only one answer is correct among these 4 choices:
- are composed of many stars.
- have a clockwise spin.
- are irregularly shaped.
- have the same number of stars.

Could you tell me which one is correct?

are composed of many stars.