Both B and C fit this question. Hope it helps! If you could vote my answer as the brainiest, that would be awesome! :)
Answer:
The earliest notated European music was Gregorian Chant. This was a monophonic form of music with all folks contributing their vocal music in 'one voice'. The oldest evidence of this notation comes from around the year 850 and was called the Musica Disciplina of Aurelian of Reome.
Explanation:
A is the answer, it smears easily
