There are three blocks, A, B and C. Block B is above A and block A is above C. Block A contains a medium black square. Block B contains two small yellow triangles. Small yellow triangle number one is below and near to a small blue triangle. It is to the right of small yellow triangle number two. One medium black circle is also in this block. It is above and to the right of small yellow triangle number two. Block C contains one big black square and one big blue triangle. Near to the big blue triangle there is the big black square. The big blue triangle is touching the right edge of this block.
What is above the big black square? a medium black square or a small blue triangle?
medium black square  small blue triangle  both of them none of them