There are three blocks, A, B and C. Block C is below A and block A is to the left of B. Block A contains one big black triangle. Block B has a medium blue square. Block C contains one medium blue triangle, a small blue square and a small yellow triangle. The medium blue triangle is above and to the right of the small yellow triangle. The small blue square is to the left of the small yellow triangle.
What is below the black triangle? a medium blue square or a yellow object?
medium blue square  yellow object both of them none of them