Answer: Option (b) is the correct answer.
Explanation:
Sound is a mechanical energy and this energy can only be transferred from one point to another if provided a medium with the help of which it can travel between these points.
Thus, we can conclude that sound travels through a medium.
When sound waves travel, they cause vibration in molecules of the matter.
In a solid, the molecules are packed tightly whereas molecules in a liquid are less tightly packed and in a gas the molecules are free to move. Thus, in a solid the sound travels faster as the molecules are close to each other.
