The correct option is C solid
Sound is a local disturbance whose propagation is facilitated by the collisions between particles; this disturbance propagates in a logitudinal wave; one molecule hitting the next molecule, and then that molecule hitting the next, and so forth.
The distances between molecules in solids are very small, i.e., solids are more dense - as compared to liquids and gases. Because they are so close, than can collide very quickly, i.e. it takes less time for a molecule of the solid to 'bump' into its neighborhood.