There are three blocks. Lets call them A, B and C. Block C is below block A and it is to the right of block B. Block A has a medium yellow triangle, a small black circle and a medium black square. Near to the medium black square , a big blue triangle and the small black circle is the medium yellow triangle. Block B contains one big black triangle, a big blue square and one small yellow triangle. The big black triangle is near to, to the left of and below the big blue square. Block C has a small black triangle, one medium blue square and one big blue triangle. This block also contains one medium yellow triangle. To the right of and below the medium yellow triangle there is the big blue triangle.. The small black triangle is to the right of the medium yellow triangle and the medium blue square.
Which object is to the left of a big blue triangle? the medium black square or the small yellow triangle?
the medium black square  the small yellow triangle  both of them none of them