There are three blocks, A, B and C. Block B is to the right of and A is above C. Block A contains one medium black square. Below a medium blue square there is the medium black square. Block B has one medium blue square and one medium black square. The medium blue square is below the medium black square. Block C has one medium blue square. It also contains one medium yellow square. The medium yellow square is below the medium blue square.
What is above the yellow thing? a medium blue square that is in block A or a medium blue square that is in block B?
medium blue square  that is in block A medium blue square  that is in block B both of them none of them