There are three blocks, A, B and C. Block B is below A. Block A is to the right of C. Block A contains a medium blue circle, a medium blue square and one small blue square. The medium blue circle is to the right of and near to the medium blue square which is near to the small blue square. It is below the small blue square. Block B has a small black square. And block C contains a medium black square.
What is above the small black square? a small blue square or a medium black square?
small blue square  medium black square  both of them none of them