Explanation
The antonym of "spurious," which means false or fake, is "genuine," meaning authentic or real. The other options—flexible, thoughtless, and provident—do not relate to authenticity. Therefore, "genuine" is the correct choice.
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The antonym of "spurious," which means false or fake, is "genuine," meaning authentic or real. The other options—flexible, thoughtless, and provident—do not relate to authenticity. Therefore, "genuine" is the correct choice.