Illustration:
Choose the set of figures which follow the given rule.
Rule: As the circle decreases in size, its sectors increase in number.
In the 1st option, though the size of the circle decreases, the no. of sectors remains the same. In the 2nd option, the no. of sectors in the 4th figure is less than that in the 3rd. Again in the 3rd choice, the no. of sectors in the 2nd figure is less than that in the 3rd. Thus, none of these options follow the rule. The correct answer is (D) and we may confirm that in the 4th option, the size of the circle decreases consistently while the no. of sectors increases.