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