There are two blocks, A and B. Block A is below B. Block A has two medium blue squares. Medium blue square number one is touching the bottom edge of this block. It is below a medium black square and medium blue square number two. The medium black square is below medium blue square number two. Block B contains a medium blue square. There is also one medium yellow square touching the bottom edge of this block. Below the medium blue square there is the medium yellow square.
What is below the yellow object? a medium blue square or a medium black square?
medium blue square  medium black square  both of them none of them