The square and the arrow swap colours at each step, and the arrow turns. Which figure is the wrong one?

The arrow turns $45^{\circ }$ clockwise each step (up, up-right, right, down-right, down) and blue and orange swap every time. In (b) the colours are right but the arrow already points right, a turn of $90^{\circ }$ instead of $45^{\circ }$, so (b) is wrong.