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