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