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