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