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