There are three blocks. We call them A, B and C. There is one small black circle in block A. Then, there is block B. It contains a medium black square, a big black circle and one big yellow square. The big yellow square is to the left of and below a medium black circle. The medium black square is above the big black circle which is to the right of the big yellow square. The big black circle is touching the right edge of this block. The medium black square is below and to the right of the medium black circle. Finally, to the right of block A we have block C. It is above block B. It contains one medium yellow triangle, a small blue square and one medium black circle. Below the medium black circle there is the medium yellow triangle. It is to the right of and below the small blue square.
What is above the medium black square? a medium yellow triangle or a big yellow square?
medium yellow triangle  big yellow square  both of them none of them