There are three blocks, A, B and C. Block A is above B and block B is below C. Block A has one medium blue triangle. Block B has a big black triangle and a big blue triangle. The big black triangle is to the left of the big blue triangle. And block C has one medium black square. To the left of and above a big blue square there is the medium black square.
What is above the big black triangle? a big blue triangle or a medium blue triangle?
big blue triangle  medium blue triangle  both of them none of them