There are three blocks. We call them A, B and C. Block A contains a medium blue triangle and one small black square. A small blue circle is above and to the left of the small black square. Below and to the right of the small blue circle there is the medium blue triangle. Then, we have block B which contains one medium blue circle. Finally, to the left of block A we have block C which is above block B. It has a small yellow circle.
What is below the small blue circle? a black square or a medium triangle?
black square  medium triangle  both of them none of them