the kind of material it is moving through the amplitude of the sound wave's vibrations the wavelength of the disturbance in the medium the type of motion that caused the sound wave to form
I gave my students this multiple choice question: Which of these factors affects how fast a sound wave moves?

Only one answer is correct among these 4 choices:
- the kind of material it is moving through
- the amplitude of the sound wave's vibrations
- the wavelength of the disturbance in the medium
- the type of motion that caused the sound wave to form

Could you tell me which one is correct?

the kind of material it is moving through