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