If anyone has all the answers to The Universe Unit Review Practice please moment them

C. a distant luminous object travels rapidly away from an observer.

Explanation:

Option C is the correct answer.

Redshift is actually observed when a distant luminous object travels rapidly away from an observer.

In redshift, observers actually see an object that is travelling away from them and it has longer wavelength. The opposite is the blueshift where observers see a light traveling towards them  and shifted to shorter wavelength.

In astronomy, redshift takes place when the object's visible light travels towards the red end of the spectrum.

"a.) well–developed vascular system."

ya the other dude is right