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.

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