We have three blocks, A, B and C. Blocks A and C are above B. Block A contains one medium yellow triangle, a big yellow square and a medium yellow square. This block also has one small blue square. A medium black circle is touching the right edge of this block. It is above and to the right of the big yellow square which is near to, below and to the left of the medium yellow square. Block B contains a big black circle and one small yellow square. The big black circle is touching the right edge of this block. This object is to the right of the small yellow square. And block C has one small black circle.
Which object is above a small yellow square? the big black circle or the medium yellow square?
the big black circle  the medium yellow square  both of them none of them