There are three blocks, A, B and C. Block C is below B. Block A is above C. Block A contains a medium blue square. Block B has a medium yellow square and one medium black square. Below the medium black square there is the medium yellow square. Block C contains one medium black square and one medium blue square. Below the medium blue square is the medium black 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 C?
the medium blue square  that is in block A the medium blue square  that is in block C both of them none of them