There are three blocks, A, B and C. Block C is below blocks A and B. Block A contains one big yellow square. Block B contains a big yellow square, one big black triangle and one medium blue triangle. There are also one big blue circle and a medium blue circle in this block. To the left of the medium blue circle and the big black triangle is the big yellow square. The medium blue triangle is touching the right edge of this block. The big yellow square is touching the bottom edge of this block.. The big black triangle is touching the bottom edge of this block. This shape is to the right of and below the medium blue circle. And block C contains a big blue square, a medium blue triangle and a medium black circle. The big blue square is below and to the left of a small blue triangle. A big yellow triangle is to the right of and below the medium black circle which is to the left of the small blue triangle.
Which object is below a medium blue triangle? the big blue square or the medium black circle?
the big blue square  the medium black circle  both of them none of them