Quote:
Originally Posted by Dowly
D was my other candidate before I noticed B lines up diagonally as well. Another thing I noticed just now about B is that all the corners of the center piece supplement the shape and colors it touches outside of it.
i.e. if you put B in the center, the top left shape is black triangle. To the left of it is a light grey triangle, diagonally there's a white triangle and upwards there's a grey triangle. All four colors are touching. This is the same for the other corners of the center B.
So that's four things going for it being B. I think I'm ready to place my bet. 
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That was basically the same reasoning I used for my answer; I was looking for a symmetry of pattern in the puzzle and the only one I could immediately see was, if "B" was inserted into the center, there was a grouping of the four shapes, all with the same pattern of shadings, in the same order.; I didn't even consider diagonal relationships...
As far as taking my reasoning to my grave, well, hyperbole...
...and I also have no desire to be an astronaut; I have enough difficulty getting across town on the bus...
<O>