There are three blocks. We call them A, B and C. Block B is to the right of A. Block C is above B. Block A contains a medium yellow square. Block B has two medium yellow squares and two other medium black squares. Medium yellow square number one is touching the bottom edge of this block. Medium black square number one is below medium yellow square number two. Medium black square number two is below medium yellow square number two. Medium yellow square number one is below medium black square number one , medium black square number two and medium yellow square number two. Block C contains two medium yellow squares. Medium yellow square number one is touching the bottom edge of this block. This shape is below medium yellow square number two.
Which object is below a medium yellow 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