Which medieval composer wrote a theory paper on the importance of new rhythms?

Philippe de Vitry

Explanation:

The medieval composer who wrote a theory paper on the importance of new rhythms was Philippe de Vitry. Philippe de Vitry was a music theorist, poet and composer who studied at the Sorbonne. He was also bishop of Meaux and a diplomat and adviser to Charles IV, Philip VI and John II. He is now mostly remembered for his treatise of music Ars Nova.

the answer would be (b). the stave church in borgund, norway is an example of norse architecture.