There are three blocks. We call them A, B and C. Block A contains a medium blue square. There is also one medium black square in this block. The medium black square is below the medium blue square. Below block A is block B which contains two medium yellow squares. Medium yellow square number one is below a medium black square. This object is below medium yellow square number two. This block also has a medium blue square. Below medium yellow square number one , the medium black square and medium yellow square number two there is the medium blue square. Below block B there is block C. It has one medium yellow square.
Which object is below a medium blue square? the medium black square which is in block B or the medium black square which is in block A?
the medium black square  which is in block B the medium black square  which is in block A both of them none of them