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