What two factors affect the speed of a sound wave as it travels through a medium?

the energy transferred by the wave and the density of the medium
the type of medium and the energy transferred by the wave
the type of medium and the temperature of the medium
the temperature of the medium and the energy transferred by the wave

The energy transferred by a sound wave is independent of its speed. However, the type of medium affects this due to the differences in the distances between particles in different media, i.e. sound travels faster through solids than gases as the solid particles are much closer together, so they collide more frequently allowing the sound to travel faster. Additionally, temperature affects the distances between particles in a medium, increasing them with increasing heat, causing slower sound travel. Therefore the answer is the third option.
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