We have three blocks. We call them A, B and C. Block A is above C and block C is above B. Block A contains one medium black square. To the left of and above the medium black square there is a big yellow square. Block B has one big blue triangle. Block C contains a medium yellow square and one medium black triangle. The medium yellow square is near to the medium black triangle.
Which object is above a medium yellow square? the blue thing or the medium black square?
the blue thing the medium black square  both of them none of them