The shaded part travels clockwise round the wheel, moving one place further at each step than at the step before. Which wheel is wrong?

The moves should be 1, 2, 3 and 4 places clockwise. From (a) to (b) is 1 place, (b) to (c) 2 places, (c) to (d) 3 places. From (d) it should move 4 places, to the part just below the right-hand side; (e) has moved only 1 place, so (e) is wrong.