A student makes the hypothesis that:

In the absence of air resistance, all objects will fall at the same rate, regardless of the object's mass.

Which of the following would be an appropriate scientific test of this hypothesis?

	a.	A crumpled piece of paper (low air resistance) and a flat sheet of paper (high air resistance) are dropped at the same time from the same height to see which hits the floor first
	b.	A feather (high air resistance) and a hammer (low air resistance) are dropped at the same time from the same height to see which hits the ground first.
	c.	A small steel ball (low air resistance) and a small lead ball (low air resistance) of the same radius (but different masses) are dropped at the same time from the same height to see which hits the ground first.
	d.	A helium filled balloon (high air resistance) and an air filled balloon (high air resistance) are dropped at the same time from the same height to see which hits the ground first.
	e.	None of the above. The only way to test this hypothesis is in an evacuated chamber that is a perfect vacuum