Without being able to hear the audio sample, I can't accurately determine the style of music. However, I can explain the terms:
- Polyphonic: This style features multiple independent melodies played simultaneously.
- Monophonic: This style involves a single melodic line without accompaniment.
- A cappella: This term refers to vocal music performed without instrumental accompaniment.
If the audio features a single melody lines sung without musical instruments, it would be either monophonic or a cappella. If there is harmony with multiple independent melodies, it would be polyphonic. If it's vocal only but could also have harmony, it could be considered monophonic and a cappella.
Based on what you hear, choose the option that best represents the audio sample.