Select the correct answer.
Which statement best defines why sound waves are mechanical waves?
OA. They require a medium in which to travel.
OB. They can travel through vacuum.
OC. They can travel only through solids.
OD. They can travel only through gases.
The medium can be any substance-solid,liquid,or gas- and the wave's speed depends on the properties of the material of the medium the wave travels through.
