We have three blocks. We call them A, B and C. Block B is below C. Block C is below A. Block A contains a small black circle and one big yellow square. To the left of the big yellow square there is the small black circle. Block B has a medium yellow square. Below the medium yellow square is a big blue square. Block C contains one small blue square and a big yellow square. A medium yellow triangle is touching the right edge of this block. Above the big yellow square there is the small blue square.. Above the big yellow square is the medium yellow triangle. It is to the right of the small object which is above the big yellow square.
What is below the black thing? a small blue square or a big blue square?
small blue square  big blue square  both of them none of them