Put the objects in groups. Change the height of the ramp. Choose different objects to roll. Record the details of the investigation.
I gave my students this multiple choice question: Juan and LaKeisha roll a few objects down a ramp. They want to see which object rolls the farthest. What should they do so they can repeat their investigation?

Only one answer is correct among these 4 choices:
- Put the objects in groups.
- Change the height of the ramp.
- Choose different objects to roll.
- Record the details of the investigation.

Could you tell me which one is correct?

Record the details of the investigation.