There are three blocks. We call them A, B and C. Block B is to the left of blocks C and A. Block A contains one medium blue triangle and a big black circle. The medium blue triangle is above the big black circle. Block B has one big blue square, a medium yellow circle and one big yellow circle. The medium yellow circle is above the big yellow circle. The big blue square is touching the bottom edge of this block. The big yellow circle is touching the right edge of this block. To the left of and below the big yellow circle is the big blue square. Block C has one medium black circle.
Which object is to the left of a medium blue object? the medium yellow circle or the medium black circle?
the medium yellow circle  the medium black circle  both of them none of them