Answer:
b. 600s C.E.
Explanation:
**Key terms & points in bold.
Historians note that Buddhism, Confucianism, and Chinese writing systems entered Japan during the 600s C.E. because this was when sinification in Japan first began to occur. Sinification is an umbrella term for the cultural influence of the Chinese on non-Chinese societies, and that was largely seen in Japan through Emperor Kammu's Taika Reforms.
While sinification began in Japan during the 600s, it stayed alive for nearly three centuries, ultimately waning in the Song dynasty.
