Answer:
Frequency
Step-by-step explanation:
As we know that the characteristics of sound is as following
Loudness : loudness of sound depends on the amplitude of sound so increasing the loudness will cause the amplitude to increase.
Quality of sound : Quality of sound depends on the type of waveform. For different waveform the quality of sound is also different.
Pitch of sound : Pitch depends on the frequency of the sound which means if the frequency of sound is more then its frequency will be more
the correct answer will be
Frequency