Answer:
East Asia was isolated by the Gobi Desert, Himalayas, Pacific Ocean, and Plateau of Tibet.
Explanation:
Gobi Desert; is correct because this desert acted as a northern geographic barrier between China and the nomadic Mongol and Turkic tribes.
Himalayas; is correct because it separated China from the Indian subcontinent.
Huang He (Yellow) River; is not correct because it was at the heart of the Chinese civilization.
Indian Ocean; is not correct because this ocean was not bordering China.
Pacific Ocean; is correct because it acted as a natural barrier on the east and southern parts of China.
Plateau of Tibet; is correct because this huge and very high plateau acted as a barrier between China and Central Asia, but also as a barrier with Southeast Asia.
