There are three blocks, A, B and C. Block A contains a small yellow square. Then, there is block B. It contains one medium blue circle, a small blue circle and one small yellow square. To the right of the small blue circle is the medium blue circle. The small blue circle is touching the bottom edge of this block. It is to the right of the small yellow square.. Below the small yellow square there is the medium blue circle. Finally, we have block C. It is above block B and below block A. It has one big black circle. There is also a medium yellow circle in this block. The big black circle is above the medium yellow circle.
Which object is below a small yellow square? the big black circle or the medium yellow circle?
the big black circle  the medium yellow circle  both of them none of them