Which of the following best describes the principal innovation of the Notre Dame school of polyphony during the 12th and 13th centuries?
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A
The use of vernacular language in sacred texts to make them more accessible to the congregation.
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B
The development of organum, which systematically added one or more independent vocal lines above a pre-existing plainchant melody.
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C
The invention of the basso continuo to provide harmonic foundation for large ensembles.
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D
The standardization of equal temperament, allowing for composition in all major and minor keys.