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A. Although many theories​ exist, the reason for Amelia​ Earhart's disappearance remained a mystery. B. Although many theories​ exist, the reason for Amelia​ Earhart's disappearance remains a mystery. C. Although many theories​ exist, the reason for Amelia​ Earhart's disappearance is remaining a mystery. D. Although many theories are​ existing, the reason for Amelia​ Earhart's disappearance remains a mystery.

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If you’re looking for the best worded answer, go for B.
User OlegYch
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