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