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