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