We have three blocks. We call them A, B and C. Block B is to the left of A. Block C is below B. Block A has one small yellow triangle. This block also has a medium blue circle. This block also has a medium black triangle.. The small yellow triangle is touching the bottom edge of this block. The medium black triangle is touching the right edge of this block. The small yellow triangle is below the medium black triangle and the medium blue circle. Block B has one medium black square. Block C has one big blue triangle, one big black triangle and a medium yellow square. The big black triangle is touching the bottom edge of this block. It is to the left of the medium yellow square. The big blue triangle is to the right of the big black triangle. The medium yellow square is touching the right edge of this block. To the left of and near to the medium yellow square is the big blue triangle.
What is to the left of the medium yellow square? a medium black square or a big black triangle that is touching the bottom edge of a block?
medium black square  big black triangle  that is touching the bottom edge of a block  both of them none of them