Answer:
A. The later Vedic Age/they are purported to be records of sages who conveyed their spiritual insights to students.
Explanation:
Upanishads were early also known as Vedanta meaning at the end of Vedas. they contain the changing philosophical notions of that time. The influence of Buddhism, Jainism, and concepts of early Hinduism can be noticed in it. They contain transitional ideas from Vedic rituals to new spiritual ideas. The idea of atman(individual soul) and brahman(universal soul) were first appeared in Upanishads.
Koreans practiced a form of Buddism which was a Chinese philosophy, during the Tang dynasty.
B. Nirification
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Britain wanted to gain land and Singapore was a major stopping point for traffic and from China. Burma has land route through south China.
ARVN and the US and the PAVN also known as the North Vietnamese Army.
