Respuesta :
A is the correct answer.
Sound waves need a medium to propagate, because sound waves need to vibrate in order to propagate. so, Sound Waves are the longitudinal waves needs a medium to propagate/move. :) have a nice day.
Sound waves need a medium to propagate, because sound waves need to vibrate in order to propagate. so, Sound Waves are the longitudinal waves needs a medium to propagate/move. :) have a nice day.