There are three blocks. We call them A, B and C. Block B is above C and block C is below A. Block A has a big black circle and a medium black circle. One medium blue square is also in this block. The big black circle is touching the right edge of this block. The medium black circle is below and near to the medium blue square. The big black circle is to the right of and below the medium black circle. Block B has a medium black square. And block C has a small blue square and one medium yellow circle. The small blue square is near to and below the medium yellow circle.
Which object is below a big thing? the yellow circle or the medium black square?
the yellow circle  the medium black square  both of them none of them