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