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