We have three blocks. We call them A, B and C. One medium black square and a medium blue square are in block A. Below the medium blue square there is the medium black square. To the left of block A we have block B. It has two medium black squares. Medium black square number one is touching the bottom edge of this block. Below a medium yellow square there is medium black square number two. Medium black square number one is below the medium yellow square and medium black square number two. To the right of block B there is block C with a medium black square and a medium yellow square in it. There is also a medium blue square in this block. It is below the medium yellow square. Below the medium yellow square and the medium blue square there is the medium black square.
Which object is to the left of a medium black square? the medium yellow square that is in block B or the medium yellow square that is in block C?
the medium yellow square  that is in block B the medium yellow square  that is in block C both of them none of them