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Explanation:

Secret and covert are synonyms. We can eliminate both because to choose one would be to choose the other. Perfidy, most commonly used to mean disloyal, also means ‘treacherous’. But, here there is no negative connotation. The author states in the first paragraph, “the talk is hard to follow when one has not made a habit of listening to it for a while. The culture of the conversation makes the words arcane.” Here, it means ‘difficult to understand’. Therefore, mysterious (baffling, puzzling, inexplicable) fits the meaning best.
Hence, the correct answer is option 1.

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