We have three blocks. We call them A, B and C. Block B is to the right of A. Block A is below C. Block A contains two medium blue squares. Below medium blue square number two there is medium blue square number one. Block B has a medium yellow square. Block C has two medium black squares. Medium black square number one is touching the bottom edge of this block. Medium black square number two is below a medium blue square. Medium black square number one is below medium black square number two and the medium blue square.
What is above the thing that is touching the bottom edge of a block? a medium yellow square or a medium black square?
medium yellow square  medium black square  both of them none of them