In terms of sound velocity, which of the following sequences is correct?

• A sound wave is transmitted through the vibrations of particles.
• When sound is created, the particles in the medium vibrate and collide with each other, causing the vibrations to pass between them.
• Since the particles in a gas-like air are generally far apart, they travel further before colliding and hence sound does not travel as quickly.
•  The particles in water are much closer together therefore vibrational energy can be transmitted quickly from one particle to the next. 
• In metals, particles are very tightly packed due to which vibrations are transmitted very quickly.

As a result, the correct statement would be: Velocity of sound in air < Velocity of sound in water < Velocity of sound in metal