There are three blocks, A, B and C. Block A contains one medium black square. Block B is to the right of block A. It contains one medium black square, one medium blue square and a medium yellow square. Below the medium blue square and the medium yellow square is the medium black square. The medium blue square is below the medium yellow square. Finally, there is block C which is below block B. It contains one medium black square.
What is to the left of the blue object? a medium black square or a yellow thing?
medium black square  yellow thing both of them none of them