These five circles should form a series, but one figure has been drawn wrongly. Which figure breaks the pattern?

Two rules work together: the number of shaded parts grows by one (1, 2, 3, 4, 5), and the first shaded part (going clockwise) moves one part clockwise each time. So the 4th circle should shade 4 parts starting from the part just before 6 o'clock. Figure (d) has 4 parts but starts at the same part as (c), just after 3 o'clock, instead of moving on — it is the wrong one.