When did polyrhythms and polytonality really become widespread? romantic era 20th century renaissance none of the above

none of the above

Explanation:

The polyrhythms and the polytonality are ways of creating music and setting up the tones and rythms of a song in order toreate variations of music, polyrhythms are using different rhythms or metrics in the same song, and polytonality is using different tones, and that becae very popular during the Baroque era, so the answer would be none of the above.