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.

from the conditions of the working class in england by friedrich engels,the main idea is :

b. after i get up in the morning,

explanation:

after is a subordinating conjunction that introduces a time clause. time clauses are dependent clauses used to indicate when something happened.

the clause "after i get up in the morning" tells when the action in the main clause (drinking a cup of coffee) happens:

"after i get up in the morning, i drink a cup of coffee." it is the most logical choice of all.