Here are three short sequences of large squares, each of which has been partitioned into nine smaller squares. Some of the smaller squares have been blacked in. For each sequence, which square on the right best continues the sequence of squares on the left?
Solution
Answers:

cain't no doubt.

d. Watch the black square.

Must be b or c (with one each, circle and square). A closer look gives us c, where the dark elements are diagonally related, as they always are in the sequence.