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