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