How did the japan imperial court contribute to the development of a national culture during the heian period

The Heian period is noted for its cultural achievements, at least at the imperial court. These include the creation of a Japanese writing (kana) using Chinese characters, mostly phonetically, which permitted the production of the world's first novel, the Tale of Genji by Murasaki Shikibu.

the answer to this question is the third option. hope this

it provided for equal trade rights among nations in china.