There are three blocks, A, B and C. Block C is below blocks A and B. Block A contains one medium blue square and one medium yellow square. The medium blue square is below the medium yellow square. Block B has one medium black square. Block C contains a medium blue square. The medium blue square is touching the bottom edge of this block. It is below a medium black square.
What is above the object that is touching the bottom edge of a block? a yellow thing or a medium black square?
yellow thing medium black square  both of them none of them