There are three blocks, A, B and C. Block A is above B and block B is to the right of C. Block A contains a small blue triangle. Block B contains one small blue triangle and a medium blue triangle. The small blue triangle is to the left of and below the medium blue triangle. Block C contains a small yellow circle and a big black square. A small black circle is below and to the left of the small yellow circle which is above the big black square. The big black square is touching the right edge of this block.
What is to the right of the black square? a small blue triangle or a medium blue triangle?
small blue triangle  medium blue triangle  both of them none of them