There are three blocks. We call them A, B and C. Block B is above A. Block C is below B. Block A contains a medium blue square, a big yellow triangle and a small black triangle. Below the small black triangle is the medium blue square. The big yellow triangle is touching the bottom edge of this block. This shape is below the small black triangle. Above the big yellow triangle is the medium blue square. Block B contains a medium black square. And block C contains one medium blue triangle.
Which object is above a yellow triangle? the medium blue triangle or the small black object?
the medium blue triangle  the small black object both of them none of them