China’s influence on Medieval Japan is illustrated by Japan’s development of "haiku poetry."
This is because haiku poetry in Japan was originally written in Chinese before it was later written in Japanese.
Also, many legendary Japanese haiku poets, such as Basho and Fujiwara no Teika, usually referred to Chinese poetry in their works.
Hence, in this case, it is concluded that the correct answer is option C. "Haiku Poetry."
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