Three or more tones sounded together produce a(n)

When three or more tones are combined together they produce what is called a chord. A chord is used in music when the tones are combined in a very harmonious way. They must be heard simultaneously.

they produce chord. chord is basically two or more notes played simultaneously. for instance, if a person is places on a piano and presses two keys simultaneously, what is produced is referred to as a chord. chords are often played in western classical music, modern west African, oceanic music and western popular music. 

Ok and idk andssddd

Ithink that b is correct but just in case wait to see if someone else answers