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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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This is a tough question for grade 1.  8 ~* C+ @& [5 n0 k0 T

+ q% {. f) s' K9 K/ X6 Z5.39.217.76I most likely cannot answer it within 5 minutes when I was that young.; x( R2 j. \" H( G, X- v! G

; s% J& W; n. V# U9 Ctvb now,tvbnow,bttvbWow, really enjoy this question.  Thank you for sharing.