There are three blocks, A, B and C. Block C is above B and block B is to the left of A. Block A contains one big blue square and a small yellow triangle. The big blue square is to the right of the small yellow triangle. Block B has a medium blue circle. Block C has a small black triangle and a medium yellow circle. The small black triangle is above the medium yellow circle. A big black triangle is above and to the right of the medium yellow circle.
What is above the medium yellow circle? a big black triangle or a medium blue circle?
big black triangle  medium blue circle  both of them none of them