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