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