There are three blocks, A, B and C. Block A has two medium blue squares. Medium blue square number one is below medium blue square number two.. A medium yellow square is touching the bottom edge of this block. It is below medium blue square number two and medium blue square number one. Then, we have block B. It contains a medium black square and a medium yellow square. Below the medium yellow square there is the medium black square. Finally, we have block C which is above block B. Block A is above it. It has one medium blue square.
What is above the thing that is touching the bottom edge of a block? a medium blue square or a black thing?
medium blue square  black thing both of them none of them