We have three blocks, A, B and C. Block A contains a big yellow square. Then, there is block B with a big black triangle in it. Block C is below both blocks B and A. It contains one medium black square and a big black triangle. Below a big yellow square there is the big black triangle. The medium black square is below the big yellow square and the big black triangle.
Which object is below a big black triangle? the big yellow square that is in block C or the big yellow square that is in block A?
the big yellow square  that is in block C the big yellow square  that is in block A both of them none of them