There are three blocks, A, B and C. One medium blue square is in block A. Block B is below block A. It contains one big yellow circle, a small black square and a small blue circle. The big yellow circle is to the left of the small black square. Above and near to the small blue circle is the small black square. Finally, we have block C to the left of block A. It contains one small black square.
What is below the medium object? a small black square that is in block B or a small black square that is in block C?
small black square  that is in block B small black square  that is in block C both of them none of them