What moves when propagation occurs through air?

sound wave

Explanation:

Soundwave is produced by vibrating objects through a medium. It can be solid, liquid or gas.  Sound moves through a medium from the point of generation to the listener. When an object vibrates, it sets the particles of the medium around it vibrating. The particles do not travel all the way from the vibrating object to the ear. A particle of the medium in contact with the vibrating object is first displaced from its equilibrium position. It then exerts a force on the adjacent particle.

Sound waves.

Explanation:

Sound waves are mechanical vibrations that propagates as an acoustic medium through transmission medium such as liquid , gas or solid.

Sound travels 343m/s through the air and it travel much faster in liquid and solids.

Sound waves moves from where it was generated to the point of listener.

that is true   : ) hope this you

i believe the answer would be b. hope it : )