There are three blocks. We call them A, B and C. Block B is above C and block C is above A. Block A has a big blue circle. Block B has a medium blue circle. And block C contains a small blue circle, a big black triangle and one small yellow circle. A big yellow circle is also in this block. It is below and to the left of the small yellow circle. The big black triangle is touching the right edge of this block. There is also a big blue circle in this block. Near to and above the big black triangle is the small blue circle. The big blue circle is below the small yellow circle.
Which object is above a big blue circle? the medium blue object or the small yellow circle?
the medium blue object the small yellow circle  both of them none of them