The correct answer is: D. Vacuum
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations.
Sound
cannot travel through a vacuum because there are no particles to vibrate and transmit the sound waves.Water, steel, and air are all materials that can transmit sound waves. Water is a good conductor of sound because it is a dense material. Steel is also a good conductor of sound because it is a dense material and has a high tensile strength. Air is a good conductor of sound because it is a gas and has molecules that are constantly moving.
A vacuum is a space that is empty of matter. There are no particles in a vacuum to vibrate and transmit sound waves. Therefore, sound cannot travel through a vacuum.