We have three blocks. We call them A, B and C. Block A has one big blue square. The big blue square is touching the right edge of this block. It also contains a small yellow square. The small yellow square is above the big blue square. To the left of block A we have block B. It contains one medium blue square. Below block B there is block C. It contains a small black square, a medium yellow square and a medium blue square. The small black square is to the right of and below the medium blue square. The medium yellow square is touching the left edge of this block. The small black square is touching the right edge of this block. It is above the medium yellow square.
Which object is below a medium blue square? the medium thing which is touching the left edge of a block or the small yellow square?
the medium thing which is touching the left edge of a block  the small yellow square  both of them none of them