There are three blocks, A, B and C. There is one medium blue triangle in block A. There is also one medium yellow circle in this block. There is also one small yellow square in this block. Below and to the left of the medium blue triangle is the small yellow square. The medium blue triangle is above the medium yellow circle. Block B is to the right of block A. It has one big black circle and one medium blue circle. One medium yellow square is also in this block. The medium blue circle is below the medium yellow square. It is touching the right edge of this block. The big black circle is below and to the right of the medium yellow square. Finally, there is block C to the right of block B. It contains one small black triangle.
Which object is to the left of a small black triangle? the medium yellow circle or the big black circle?
the medium yellow circle  the big black circle  both of them none of them