The option that is not a required solution in classical music is C. Repetition and return of the themes.
Classical music simply means the standard music of the countries that are in the Western World. It was typically composed by musicians who were trained in the art.
In order to form classical music, there should be a repetition of transitions to emphasize the themes, clear cadences to strengthen the theme and smooth transitions between themes.
It should be noted that the repetition and return of the themes isn't part of the options required for forming such music.
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