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