There are three blocks, A, B and C. Block B is above C and block C is above A. Block A has one big yellow square and a medium black square. Above the medium black square there is the big yellow square. Block B has one big blue triangle. And block C has a medium yellow square and a medium black triangle. Near to the medium black triangle there is the medium yellow square.
Which object is below a blue object? the medium yellow square or the medium black triangle?
the medium yellow square  the medium black triangle  both of them none of them