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