I'm looking at it now (I thought you were talking about another one I was confused about, I think that was test 2 or 3 though.) Anyway, I think in a situation like this, you have to use process of elimination... even if it was indeed flat at the bottom, the only choice representing that would be C, which doesn't really work b/c it's too small, and the left sharp edge is too tiny, AND there is no pointy thing coming out of the side like there should be (from the view given, it is pretty clear that pointed top of the S type figure should be protruding...)
make sense? sorry for my weird answer, definitely only makes sense if you look at the problem while reading along 🙂