We have three blocks, A, B and C. Block A has a small blue square. Above the small blue square there is a big blue square. Block B is above block A. It contains one big yellow circle. Finally, we have block C above block B. It contains one medium yellow triangle and one small yellow triangle. The medium yellow triangle is to the right of and above the small yellow triangle.
What is above the big blue square? a small yellow triangle or a medium yellow triangle?
small yellow triangle  medium yellow triangle  both of them none of them