There are three blocks. We call them A, B and C. Block B is below C and block A is to the right of B. Block A has a big blue triangle and one medium blue triangle. There is also one big blue square touching the right edge of this block. Far from, to the left of and below the big blue square there is the big blue triangle. Block B has one medium yellow triangle. Block C has one big black square, a small blue square and one medium yellow square. It also has one small blue triangle. There is also a big black triangle in this block. To the right of and near to the small blue square there is the big black square. To the right of, above and near to the medium yellow square which is below the small blue triangle is the small blue square.
Which object is above a medium yellow triangle? the big black square or the medium blue triangle?
the big black square  the medium blue triangle  both of them none of them