There are three blocks, A, B and C. Block C is to the left of and A is below B. Block A contains a big yellow circle, one big blue triangle and one medium blue circle. The big yellow circle is to the left of the medium blue circle. The big blue triangle is below and to the left of the medium blue circle. The big yellow circle is below the big blue triangle. The medium blue circle is touching the right edge of this block. Block B contains a medium blue triangle. Block C has a medium yellow square.
What is to the left of the medium blue circle? a medium blue triangle or a big blue triangle?
medium blue triangle  big blue triangle  both of them none of them