There are three blocks, A, B and C. Block A has a medium blue square, a medium yellow square and a medium black square. Below the medium black square and the medium yellow square is the medium blue square. The medium yellow square is below the medium black square. To the right of block A there is block B. It contains a medium black square. Above block A there is block C. It has one medium blue square and a medium yellow square. The medium blue square is touching the bottom edge of this block. It is below the medium yellow square.
Which object is to the left of a medium black square? the medium yellow square that is in block C or the medium yellow square that is in block A?
the medium yellow square  that is in block C the medium yellow square  that is in block A both of them none of them