The historical setting for the composition of the earlier upanishads was and
a. the later vedic age/they are purported to be records of sages who conveyed their spiritual insights to students.
b. the life of the historical buddha/ these are records of his sermons as recorded by his disciples.
c. the mauryan empire/they are a record of king ashoka’s edicts.
d. the early vedic age/ they are a record of the hymns orally transmitted by the priestly clans among the indo-aryans peoples.

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.

d

explanation:

it refers to race, i am pretty sure this was a popular term in nazi germany or something.