There are three blocks, A, B and C. There are one medium black square and one medium blue square in block A. Below the medium blue square is the medium black square. Block B is below block A. It contains one medium yellow square. To the left of block B there is block C with one medium black square and one medium blue square in it. Below the medium blue square is the medium black square.
Which object is to the left of a yellow thing? the medium blue square that is in block A or the medium blue square that is in block C?
the medium blue square  that is in block A the medium blue square  that is in block C both of them none of them