______________ is the matter or substance through which sound is transmitted.

Correct option is B

The correct answer is (b) Medium.
Medium: In the context of sound transmission, a medium is any matter or substance through which sound waves travel. Sound requires a medium to propagate, as it is a mechanical wave and cannot travel through a vacuum. Common mediums include air, water, and solids. The particles of the medium vibrate to transmit sound waves from one location to another.
· Air: The most common medium for sound transmission, especially for human communication. Sound waves travel through the vibration of air molecules.
· Water: Sound travels faster in water than in air due to the higher density of water molecules, which allows sound waves to propagate more efficiently.
· Solids: Sound travels even faster in solids because the particles are closely packed, allowing for quicker transmission of vibrations.