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I encountered the problem from other people's postings online. I'm not able to find anything interesting from the given diagrams. I have vague memory of tackling similar type of diagrams before and being not able to solve it.

I believe there must be some reasoning trick I've not mastered yet. Could someone please help me figure that out?

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closed as off topic by Arthur Fischer, Hagen von Eitzen, Henry T. Horton, Alexander Gruber, TMM Feb 21 '13 at 18:26

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Might have something to do with the number of edges and corners... –  Valtteri Feb 21 '13 at 17:55
    
@Valtteri Didn't think about that. I'll have a try. Thanks. –  Terry Li Feb 21 '13 at 17:57
    
@Valtteri Oh my goodness! You are probably right! The answer may be D. The numbers of edges are 2, 4, 6, 8, 10...Thank you very much. Feel free to add an answer if you'd like to :) –  Terry Li Feb 21 '13 at 18:01
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The "answer" could also be B, because that is the only choice making the area of the interiors of the figures strictly increasing. So you see, this kind of problem is not a well-defined math problem. –  Trevor Wilson Feb 21 '13 at 18:41
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[logic]$\neq$"Oh, that must be logical!". –  Asaf Karagila Feb 21 '13 at 19:06

1 Answer 1

up vote 1 down vote accepted

OK. Number of edges are $2,4,6,8...$ :D

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Thank you, my first accepted answer :) –  Valtteri Feb 21 '13 at 18:04
    
You deserve it :) –  Terry Li Feb 21 '13 at 18:05

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