There are three blocks, A, B and C. Block A is below block B and to the left of block C. Block A has two medium black squares. One medium blue square is also in this block. The medium blue square is near to a medium yellow triangle which is to the left of medium black square number one. It is below and to the left of medium black square number one. Above medium black square number two is medium black square number one. Block B contains one big blue square. Block C contains a big yellow square and one small blue triangle. Below and to the left of the small blue triangle there is the big yellow square.
What is above the medium yellow triangle? a small blue triangle or a big blue square?
small blue triangle  big blue square  both of them none of them