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The correct answer is C - proximity to China encouraged the spread of Buddhism and other practices South into Indochina.
Buddhism entered Han China through the Silk Street, starting in the first or second century CE.[5][6] The previously archived interpretation endeavors by Buddhist priests in China were in the second century CE by means of the Kushan Domain into the Chinese region lining the Tarim Bowl under Kanishka. These contacts communicated strands of Sarvastivadan and Tamrashatiya Buddhism all through the Eastern world.
Theravada Buddhism created from the Pāli Standard in Sri Lanka Tamrashatiya school and spread all through Southeast Asia. In the mean time, Sarvastivada Buddhism was sent from North India through Focal Asia to China.
Direct contact between Focal Asian and Chinese Buddhism went on all through the third to seventh hundreds of years, much into the Tang time frame. From the fourth century ahead, Chinese explorers like Faxian (395-414) and later Xuanzang (629-644) began to venture out to northern India to get further developed admittance to unique sacred texts. Between the third and seventh hundreds of years, portions of the land course interfacing northern India with China was controlled by the Xiongnu, Han tradition, Kushan Domain, the Hephthalite Realm, the Göktürks, and the Tang line. The Indian type of Buddhist tantra (Vajrayana) arrived at China in the seventh hundred years. Tibetan Buddhism was similarly settled as a part of Vajrayana, in the eighth 100 years.
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