There are two blocks. We call them A and B. Block A is to the left of B. Block A contains one medium blue square. A medium black square is below the medium blue square. Block B contains one medium blue square, a medium black square and a medium yellow square. The medium blue square is below the medium black square and the medium yellow square. Below the medium yellow square there is the medium black square.
Which object is to the left of a medium black square? the medium blue square that is in block A or the medium blue square that is in block B?
the medium blue square  that is in block A the medium blue square  that is in block B both of them none of them