Final answer:
The speed of sound depends on the properties of the medium, including density, temperature, and state, which influence sound wave vibrations.
Step-by-step explanation:
The data transfer speed of a wide area network (WAN) depends on its interconnections.
When considering the question of what the speed of sound depends on, the correct answer is d. The properties of the medium. The speed at which sound travels through a medium is affected by factors such as the medium's density, the temperature, and its state (solid, liquid, or gas). These properties determine how quickly the sound waves can vibrate through the medium. The wavelength and the frequency of the wave describe aspects of the sound wave itself, but they do not determine the speed of sound. The size of the medium does not affect the speed but may impact the distance the sound can travel before it is dampened or lost.