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