How were citizens' rights determined under the absolute monarchies in Spain and France? by the ruling monarch by the elected legislature by the citizens themselves by the nobility

By the ruling monarchs.

Explanation:

The term Absolute monarch refers to the ruler or the monarch that has a complete control and power. Hence, this kind of monarch is also responsible for determining the rights of the citizens'. On the other hand, the term "elected representatives" refers to a body that represents the people that have elected them who is to determine their (citizens') rights in return. "By the citizens themselves" simply refers to direct democracy, where the people have direct votes. "By nobility" means, people who have higher ranks have more power.