ANSWER
c. They are disturbed and vibrate but do not travel with the wave.
Step-by-step explanation
Sound waves are mechanical waves. They travel through the medium - usually air, by disturbing the particles. The ones closer to the source will move a bit further, hitting the particles in front of them. Then, these particles do the same until they get to the receiver - for example, your ears.
There is a small displacement, but the particles do not move along with the wave, but they vibrate generating other particles next to them to do the same and, therefore, transmit the sound wave.