There are three blocks. We call them A, B and C. Blocks C and A are to the left of B. Block A has one medium black triangle. Block B has a small yellow triangle, a small yellow square and one big black triangle. The small yellow triangle is to the left of the big black triangle. This object is below the small yellow square which is to the left of the big black triangle. And block C has one big yellow square.
Which object is to the right of a big yellow square? the big black triangle or the medium black triangle?
the big black triangle  the medium black triangle  both of them none of them