Gloria is designing an experiment to investigate how different kinds of wheels accelerate down a ramp. Which is the dependent variable? Type of Wheel Acceleration of Wheel
Radius of Wheel
Steepnes of Ramp

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.