Final answer:
The correct statement about the speed of sound is that it travels faster in water than in air, due to the differences in density and rigidity of the mediums. Temperature and pressure of the medium can also affect the speed of sound.
Step-by-step explanation:
The statement that is true about the speed of sound in water and air is A) Sound travels faster in water than in air. This is because sound waves are able to travel through the denser medium of water more quickly than through the less dense medium of air. The speed of sound is influenced not only by the medium's density but also by its rigidity or compressibility, with sound traveling faster in mediums that are more rigid and less compressible. Additionally, sound waves move faster in solids than in liquids, and faster in liquids than in gases. The temperature of the medium also affects the speed of sound, with sound typically traveling faster in hotter substances due to particles moving more quickly. At sea level, where air pressure is higher, sound also travels faster compared to high elevations with lower air pressure.