I would say "C" as well. Nut A fits Bolt A and Nut B fits Bolt B. Then we are told that Bolt A and Bolt B are exactly the same, so if they are the same then Bolt A will fit anything that is the same.
May 6, 2016
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Since bolt A and Bolt B are exactly the same and Nut A fits on Bolt A/ Nut B fits on Bolt B, I would go for "c". I don't think "a" is correct because we don't know how bigger a nut C than bolts A and B.