We have three blocks. We call them A, B and C. Block A is to the right of and C is above B. Block A contains a medium black square and a medium yellow square. Below the medium yellow square there is the medium black square. Block B has a medium black square and a medium yellow square. The medium black square is below the medium yellow square. Block C has one medium black square. A medium blue square is below the medium black square.
Which object is below a medium black square? the medium yellow square that is in block B or the medium yellow square that is in block A?
the medium yellow square  that is in block B the medium yellow square  that is in block A both of them none of them