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