There are three blocks, A, B and C. Block A is to the right of block C and it is below block B. Block A contains one small blue triangle. Block B has a big blue square and one medium black triangle. To the right of and above the medium black triangle is the big blue square. And block C has one big yellow triangle, one big blue square and one medium yellow triangle. The big yellow triangle is below, near to and to the right of the medium yellow triangle. The big blue square is to the left of the medium yellow triangle and a small yellow triangle. The small yellow triangle is above a small blue triangle.. The small blue triangle is touching the right edge of this block. The big yellow triangle is near to the small blue triangle.
Which object is to the left of a small blue triangle? the black shape or the medium yellow triangle?
the black shape the medium yellow triangle  both of them none of them