The correct answer is D. Both limit the number of people that exercise.
Explanation:
In oligarchy and monarchy, the number of people that hold power is limited. Indeed, in monarchy, the power is mainly exerted by the king/queen or monarch. Moreover, this power is passed to the heir, who is usually the son/daughter of the monarch.
Similarly, in an oligarchy, citizens do not hold power, but this is exerted by a small group of people, who are part of a dominant social class and exert power according to their interests. This means in monarchy power is exercised by one individual, while in aristocracy the power is exercised by a few privileged people. According to this, one difference is that "both limit the number of people that exercise".
