what type of waves are sound waves?\na transverse waves\nb surface waves\nc longitudinal waves\nd light waves

Brief Explanations:

Sound waves are mechanical waves that propagate by the back - and - forth vibration of particles in the medium in the direction of wave propagation, which is the characteristic of longitudinal waves. Transverse waves have particle vibration perpendicular to wave propagation, surface waves are at the interface between two media, and light waves are electromagnetic waves not related to sound.

Answer:

C. longitudinal waves