The characteristics of musical sound are:
A. Intensity
B. Frequency
C. Quality
D. All

Hint: Three major characteristics of a sound are loudness, pitch and consistency. Even without hearing them, we may make a difference between the voice of a man and the voice of a woman with the same loudness. This is how the voice of a man and the voice of a woman vary in tone. The voice of a man is flat with a low tone, while the voice of a woman is shrill with a high pitch.

Complete step by step answer:
The characteristics of a musical sound are as follows:
1) Intensity: A musical sound's amplitude defines its loudness. A musical sound's loudness is a measure of the energy of the sound hitting the ear every second. The higher the sound energy per second that hits our ears, the louder the musical sound seems to be.

2) Frequency: A musical sound's frequency decides its pitch. Frequency and pitch are equal directly to each other. Pitch is the auditory characteristic from which we can discern the same loudness from different sounds.

3) Quality: Quality (or timbre) is a musical sound characteristic that helps one to differentiate between the sounds of the same pitch and the loudness produced by various musical instruments. A musical sound's consistency depends on the type of the sound wave (or waveform) generated by it.

So, the correct answer is “Option D”.

Note:
The sound that gives our ears a good effect is called music, while the sound that gives our ears an unwanted or disturbing effect is called noise. Higher the energy associated with the sound, the larger distance it can travel.