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