We have three blocks, A, B and C. Block A has a big blue triangle and a medium black circle. Below and to the left of the medium black circle there is the big blue triangle. Block B is above block A. It contains one small black triangle and one big yellow circle. The big yellow circle is touching the right edge of this block. Above the small black triangle which is to the left of and below the big yellow circle is a big blue circle. The small black triangle is touching the bottom edge of this block. Finally, we have block C. It is to the left of block B. It contains a medium blue triangle and one medium blue square. Far from the medium blue triangle which is to the left of the medium blue square there is a big blue triangle. This object is above the medium blue square.
Which object is to the left of a big circle? the medium black circle or the medium blue triangle?
the medium black circle  the medium blue triangle  both of them none of them