There are three blocks, A, B and C. Block A contains a big black square. Block B is above block A. It has one medium black triangle. This block also contains one medium yellow triangle. The medium yellow triangle is below the medium black triangle. Above block B there is block C with one small black triangle and one small yellow triangle in it. To the right of the small black triangle is a small black square. This object is above and to the right of the small yellow triangle.
Which object is above a black square? the small black triangle or the medium yellow triangle?
the small black triangle  the medium yellow triangle  both of them none of them