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