There are three blocks, A, B and C. Block A contains one small yellow square and one medium blue square. The small yellow square is above and to the left of the medium blue square. Above the medium blue square is a big black circle. Block B is to the right of block A. It has one medium yellow square. Finally, there is block C. It is above block A. It has one small blue triangle. To the left of the small blue triangle there is a medium black circle.
Which object is below a medium black circle? the big black circle or the medium yellow square?
the big black circle  the medium yellow square  both of them none of them