A student wants to know if the effect of gravity is the same on all objects. She follows these steps.

1. Drop a 5-gram ball, a 10-gram ball, and a 12-gram ball from a height of 10 meters.
2. Record how long it takes for each object to hit the ground.
3.
?
Which step should be next?
(1 point)
O Measure the mass of the balls again.
O Perform a second trial
O Choose new balls.
© Drop the balls from a different height.