Which idea is included in the concept of natural law?
a. ethical principles can be discovered through reason.
b. philosopher-kings tell citizens what ethical principles are.
c. governments and people cannot exist without each other.
d. none of these ideas are included.

The idea that is includen in the concept of natural law is option A.

Ethical principles can be discovered through reason.

Natural law refers to a philosophy expressing that certain rights are inherent by virtue of human nature, endowed by nature (by God or a transcendent source) and that these can be understood universally through human reason. As determined by nature, the law of nature has to be objective and universal. Besides, it exists independently of human understanding.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

the respondent is the party against whom a petition is filed