There are three blocks, A, B and C. Block A has a small yellow triangle. Then, there is block B which contains one medium blue triangle, one small black circle and one small blue triangle. The medium blue triangle is to the right of a small black triangle and the small black circle. The small black triangle is above the small blue triangle. To the left of the small blue triangle is the medium blue triangle. Finally, we have block C below blocks A and B. It contains one big black circle and a small blue circle. This block also has a big yellow square. The big yellow square is to the right of the big black circle which is to the left of the small blue circle. This object is above the small blue circle.
Which object is below a small yellow triangle? the medium blue triangle or the small black triangle?
the medium blue triangle  the small black triangle  both of them none of them