There are three blocks. We call them A, B and C. Block B is below block A and to the right of block C. Block A contains one big yellow circle. A small yellow triangle is to the left of and below the big yellow circle. Block B contains a medium black square and a small blue square. There is also a small black circle in this block. This object is above and to the right of the small blue square.. The medium black square is touching the top edge of this block. It is to the right of and above the small blue square. Block C has a medium black triangle and a big black triangle. The medium black triangle is near to, above and to the left of the big black triangle.
Which object is above a medium black square? the big black triangle or the small yellow triangle?
the big black triangle  the small yellow triangle  both of them none of them