The speed of sound is affected by which of the following factors?

The speed of sound is indeed affected by the medium's temperature. When the temperature of a medium, such as air, increases, the molecules within that medium move faster. This increased movement allows sound waves to propagate more quickly, as the energy can be transmitted more effectively between the particles. Conversely, as the temperature decreases, the molecular motion slows down, leading to a reduction in the speed of sound.

Other factors like the frequency of the wave and the amplitude can influence aspects such as the pitch and loudness of the sound but do not affect the speed at which sound travels through a medium. Additionally, while distance traveled is a factor in understanding how far sound has moved over time, it does not impact the inherent speed of sound itself.