We have three blocks. We call them A, B and C. Block B is above A. Block C is above B. Block A contains a medium yellow square. This block also has a big yellow square. Above and to the left of the big yellow square there is the medium yellow square. Block B has one medium yellow circle and one big blue triangle. The medium yellow circle is to the right of the big blue triangle. And block C has one big blue square. This block also has one small black square. Below and to the left of the small black square there is the big blue square.
What is below the black square? a thing which is touching the bottom edge of a block or a big blue square?
thing which is touching the bottom edge of a block  big blue square  both of them none of them