We have three blocks. Lets call them A, B and C. Block B is to the left of C. Block C is above A. Block A has one medium blue square and one medium black square. The medium blue square is touching the bottom edge of this block. It is below the medium black square. Block B contains a medium yellow square. And block C contains a medium blue square. The medium blue square is touching the bottom edge of this block. It is below a medium black square.
Which object is below a medium blue square? the medium black square that is in block C or the medium black square which is in block A?
the medium black square  that is in block C the medium black square  which is in block A both of them none of them