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