There are three blocks, A, B and C. Block B is to the left of C. Block A is to the left of B. Block A has a medium blue square. Block B contains two medium black squares. Below medium black square number two is medium black square number one. This block also contains one medium yellow square. Below medium black square number two and medium black square number one is the medium yellow square. And block C has one medium blue square.
Which object is to the left of a medium blue square? medium black square number two or medium black square number one?
medium black square  number two medium black square  number one both of them none of them