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