There are three blocks. We call them A, B and C. Block B is above A. Block A is above C. Block A has a small yellow triangle. Block B contains a small black triangle. Block C contains one small blue square, a medium yellow square and one medium blue triangle. The medium yellow square is below a big black triangle and the medium blue triangle. One medium black triangle is also in this block. This shape is to the left of and above the big black triangle.
What is above the medium yellow square? a small yellow triangle or a medium black triangle?
small yellow triangle  medium black triangle  both of them none of them