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