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