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