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I think is C.
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Since A & B will have no way to know, and D did not know the answer.
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8 }/ w9 P* T- x: k  z公仔箱論壇This is a tough question for grade 1.  公仔箱論壇* i& u5 O9 ~: `0 F5 V* ]9 _. r# U

/ U: B. u, Y' r5 i$ J5.39.217.77:8898I most likely cannot answer it within 5 minutes when I was that young.
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! q2 s* |% `3 I& r" s) g( QWow, really enjoy this question.  Thank you for sharing.