The speed of the sound depends upon the _________ properties of the medium.

Correct option is A

The speed of sound depends on all of the listed properties: pressure, temperature, and elasticity of the medium.
Density: Generally, a denser medium makes sound travel slower. Imagine sound waves as vibrations passing between particles. In a denser medium, the particles are closer together, making it harder for the vibrations to propagate quickly.
Temperature: For most mediums, an increase in temperature increases the speed of sound. Higher temperatures make the particles in the medium move faster, allowing sound waves to travel more efficiently.
Elasticity: Elasticity refers to a medium's ability to resist deformation. Higher elasticity allows the medium to transmit sound waves more effectively, leading to a faster speed of sound.