Of the major religions that emerged from the Indo-Gangetic plain,which spread the furthest (to China,Korea,Japan and Southeast Asia)?

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Buddhism is the major religion that emerged from the Indo-Gangetic plain, which spread the furthest to China, Korea, Japan, and Southeast Asia. Hinduism and Sikhism primarily have followers in South Asia, while Mormonism and Islam originated outside of the region.

Of the Major Religions That Emerged from the Indo-Gangetic Plain,which