Final answer:
The correct answer is option D) pitch.
Step-by-step explanation:
The frequency of sound waves corresponds to our perception of pitch. While loudness is perceived due to intensity and is measured in decibels, and timbre is the quality of sound that makes it distinct (such as the difference in sound between a piano and a violin playing the same note), pitch specifically relates to how high or low a sound appears to our ears.
This is directly linked with the frequency of the sound waves; higher frequencies produce higher pitches, while lower frequencies result in lower pitches.