What evidence might you present when determining if a song is monophonic?

A: The song is an example of organum in which one singer sings the melody and others sing harmony.

B: The song includes one melody line that can be sung or played by multiple people. It could also be an example of plainchant.

C: The song is an example of a madrigal in which 4-6 voices sing different melodies simultaneously.

D: The song is sacred.​