There are three blocks. We call them A, B and C. Block A is below B and block B is to the left of C. Block A contains one big yellow square and a small blue circle. This block also has a medium black circle and one big blue triangle. Above and to the right of the big blue triangle there is the big yellow square. It is touching the right edge of this block. The medium black circle is near to, below and to the right of the big blue triangle. Block B has a medium yellow square. Block C has one big yellow square, one medium blue square and one medium blue triangle. Below and to the left of a small yellow triangle is the medium blue triangle. This block also has a medium blue circle. The medium blue square is below the medium blue triangle and the medium blue circle. The small yellow triangle is touching the right edge of this block.
What is below the medium yellow square? a medium black circle or a medium blue triangle?
medium black circle  medium blue triangle  both of them none of them