We have three blocks. We call them A, B and C. Blocks B and C are above A. Block A has a big blue square and a small yellow triangle. To the left of the small yellow triangle is the big blue square. Block B contains one medium blue triangle. And block C contains one medium yellow circle and one small blue square. There is also a medium black circle touching the right edge of this block. The medium yellow circle is near to and to the left of the medium black circle. It is above the small blue square.
Which object is above a small yellow triangle? the small blue square or the big blue square?
the small blue square  the big blue square  both of them none of them