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Explanation:

(c) is the correct answer choice.
The concept that because humans can perceive the world around them, they are the ‘revealers’ of reality,
has been highlighted in the second para: ‘... that man is the means by which things are manifested’. — ‘With each of our acts, the world reveals to us a new face’.
Option (a), though implicit in the passage, is not the central point of the author.
Option (b) and (d) talk of the unity of nature, but it is not relevant to the central idea of the passage.