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