Concept:The pitch of a sound is directly linked to its frequency.
Explanation:When frequency
f of a sound wave increases, the number of vibrations per second becomes larger.
The human ear perceives this increased frequency as a higher pitch.
For example, a whistle with high frequency produces a higher-pitched sound than a drum with low frequency.
A longer wavelength would require a lower frequency, so that option is not correct.
Loudness depends on amplitude, not frequency, and overtones depend on the harmonic content of the sound.
Therefore, increasing frequency only makes the sound higher in pitch.
Answer:A. higher pitch