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