The yellow square and the orange arrow both turn at every step, but by different amounts and in different directions. Which figure comes next?

The square turns $45^{\circ }$ anticlockwise each time, so it alternates between standing flat and standing on a corner. The arrow turns $90^{\circ }$ clockwise: up, right, down, left. Next the square stands flat and the arrow points up: (b). (a) leaves the square on its corner, (c) and (d) turn the arrow wrongly.