Concept:The quality of a note, also called its timbre, is determined by the overtones it contains.
Explanation:A musical note consists of a fundamental frequency together with several higher frequencies called overtones.
The quality of a note is what makes the same note played on a piano and a violin sound different.
This difference arises because different instruments produce overtones with different numbers and intensities.
Frequency determines pitch, while amplitude determines loudness.
Neither frequency nor amplitude decides the quality of a note.
Hence, quality depends on the overtones present in the sound.
Answer:C. overtones