There are three materials A, B & C. The densities of these are-

σ_A > σ_B > σ_C  

The order of speed of sound is-

CONCEPT:

Sound in air: In gas-like air, the particles are generally far apart so they travel further before they bump into one another. There is not much resistance to movement so it doesn’t take much to start a wave, but it won’t travel as fast.

Sound in water: In water, the particles are much closer together, and they can quickly transmit vibrational energy from one particle to the next. This means that the sound wave travels over four times faster than it would in air, but it takes a lot of energy to start the vibration.

Sound in solids: In a solid, the particles are even closer together and linked by chemical bonds so the wave travels even faster than it does in either liquid or air, but you need quite a lot of energy to start the wave at the beginning

Explanation:

• From the above, it is clear that the more the density, the more is the speed

The correct order of speed is

⇒ V_A > V_B > V_C

So, option 2 is correct.