There are three blocks, A, B and C. Block A contains a medium yellow circle, a big black circle and one small blue triangle. The big black circle is touching the right edge of this block. To the left of the big black circle there is the medium yellow circle. It is below and to the right of the small blue triangle. Below block A is block B. It has a small black square. A medium black square is also touching the right edge of this block. This block also has a small yellow square. To the right of the small yellow square and the small black square there is the medium black square. Finally, there is block C which is below block B. It has a medium blue triangle, a small yellow square and a big blue square. The big blue square is touching the right edge of this block. The medium blue triangle is near to the big blue square and the small yellow square.
What is below the medium yellow circle? a small yellow square or a small black square?
small yellow square  small black square  both of them none of them