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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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# A+ o% q! M  }6 S( Y; J. `6 z5.39.217.77:8898This is a tough question for grade 1.  
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I most likely cannot answer it within 5 minutes when I was that young.. T: e+ ^* X2 R' b
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Wow, really enjoy this question.  Thank you for sharing.