There are three blocks, A, B and C. Block B is above block C and to the left of block A. Block A has a small blue triangle. Below a small yellow square there is a big blue square. The small blue triangle is below the small yellow square. Above the triangle which is below the small yellow square is the big blue square. Block B contains a small blue triangle and a small black triangle. To the left of the small black triangle is the small blue triangle. Block C contains a small yellow triangle.
Which object is above a small blue triangle? the black shape or the small yellow square?
the black shape the small yellow square  both of them none of them