There are three blocks. We call them A, B and C. Block A contains one small yellow square. Then, there is block B. It contains two small yellow triangles. A medium black square is to the right of small yellow triangle number one and small yellow triangle number two. A medium blue square is touching the right edge of this block. A big blue circle is touching the left edge of this block... The medium black square is below the medium blue square. Finally, we have block C which is to the left of block B and above block A. It contains a medium yellow circle and one big black square. One medium black triangle is also in this block. Above and to the right of the medium yellow circle which is below the big black square is the medium black triangle.
Which object is to the left of a thing that is touching the right edge of a block? the big black square or the medium black square?
the big black square  the medium black square  both of them none of them