We have three blocks, A, B and C. Block C is to the left of B and block B is below A. Block A has one big black circle. Block B has one medium black triangle, a small black square and one medium yellow circle. The medium black triangle is near to the small black square and the medium yellow circle. The medium black triangle is touching the bottom edge of this block. Above the medium yellow circle there is the small black square. Block C has a big yellow triangle.
What is above the black square? a big black circle or a medium yellow circle?
big black circle  medium yellow circle  both of them none of them