We have three blocks, A, B and C. Block B is above blocks C and A. Block A contains one medium black square. Block B contains a medium yellow square and a medium black square. Below the medium black square is the medium yellow square. And block C has one medium blue square. It also has one medium black square. Below the medium black square there is the medium blue square.
What is below the yellow shape? a medium black square which is in block C or a medium black square that is in block A?
medium black square  which is in block C medium black square  that is in block A both of them none of them