There are three blocks, A, B and C. Block A contains a medium yellow square. Block B is to the left of block A. It has a medium yellow square. Below the medium yellow square there is a medium blue square. Below block B there is block C with two medium black squares in it. Medium black square number one is below medium black square number two.
Which object is above a medium black square? the medium yellow square which is in block B or the medium yellow square which is in block A?
the medium yellow square  which is in block B the medium yellow square  which is in block A both of them none of them