ExplanationThe blank describes the kind of meanings that don’t become clear for years, so you need something like hidden or unclear. Both manifest and lucid are nearly the opposite of what you’re looking for, so eliminate choices (B) and (F).
Neither banal, which means trite and commonplace, nor nascent, which means newly formed, is supported by the sentence, so eliminate choices (A) and (D). Both oblique and allusive can mean unclear, so choices (C) and (E) give you appropriate, equivalent sentences.
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