Answer;
B.The source producing the overtones in the sound
The source producing the overtones in the sound, would not be taken into consideration when describing the quality of a sound.
Step-by-step explanation;
-The quality of the sound describes those characteristics of sound which allow the ear to distinguish sounds which have the same pitch and loudness
-The quality of a sound depends on its wave form, which varies with the number of overtones, or harmonics, that are present, their frequencies, and their relative intensities.
-The source producing the overtones in the sound does not affect the quality or timbre of the sound, and therefore would not be considered when describing the quality of the sound.