There are three blocks, A, B and C. Block B is to the left of A. Block C is below B. Block A contains a medium black triangle and a medium black square. The medium black triangle is below the medium black square. Block B contains a medium blue square. Block C contains one medium blue square, a small yellow square and one small blue square. The medium blue square is to the right of the small yellow square and a medium black square. The small blue square is below and to the left of the medium black square. The small yellow square is above the square which is below the medium black square. This shape is below the medium black square.
Which object is below a medium blue square? the small yellow square or the medium black triangle?
the small yellow square  the medium black triangle  both of them none of them