There are three blocks. We call them A, B and C. Block A has a big blue triangle. To the right of block A we have block B with two big black circles in it. One small yellow square is also in this block. This block also contains one small yellow triangle. Big black circle number one is touching the bottom edge of this block. Big black circle number two is above and near to the small yellow square. To the left of the small yellow square and the small yellow triangle is big black circle number one. Finally, we have block C which is above block B. It contains a big yellow square and a medium blue square. To the right of the medium blue square is the big yellow square. The medium blue square is touching the bottom edge of this block.
What is below the blue square? a big black circle or a big yellow square?
big black circle  big yellow square  both of them none of them