What is a significant contribution of Zeami Motokiyo to Noh theatre?

a
The invention of kumadori makeup
b
Writing influential treatises like Kadensho
c
Innovations in Kabuki stage design
d
Introduction of Kyogen as an interlude

b. Writing influential treatises like Kadensho

Zeami Motokiyo made a significant contribution to Noh theatre by writing influential treatises such as Kadensho, which outlined important principles and techniques for Noh performance. His writings continue to be studied and followed by Noh performers and scholars today, shaping the way Noh theatre is understood and practiced.