Final answer:
The introduction of the kana scripts, including Katakana and Hiragana, made writing more accessible for Japanese speakers, true to their pronunciation of words, and led to increased literary production.
Step-by-step explanation:
The statement that the kana scripts increased vernacular Japanese literary production is true. The development of kana, including Katakana and Hiragana, allowed for a more accurate representation of Japanese sounds, as opposed to the Chinese characters previously used. This innovation made writing more accessible and expressive for native Japanese speakers, particularly women of the Heian court who played a significant role in the arts. These scripts led to a surge in Japanese literary activity, with writing no longer limited to those educated in Chinese script. Subsequently, new genres of literature emerged, including poetry and prose that reflected the vernacular language and court life, as seen in the vibrant narratives and images produced by Japanese courtiers.