Concept:The intensity or loudness of a sound is determined by the energy carried by the wave, which depends on its amplitude.
Explanation:The amplitude of a vibration measures the maximum displacement of the vibrating object from its rest position.
A larger amplitude transfers more energy, producing a louder or more intense sound.
A smaller amplitude transfers less energy, producing a softer sound.
Therefore, intensity is directly linked to amplitude, not to frequency, wavelength, or overtones.
Answer:D. Amplitude