Which enlightenment principle is most clearly reflected in this phrase from the declaration of independence?
life, liberty and the pursuit of happiness
a. natural rights
b. social contract
c. separation of powers
d. popular sovereignty

The correct answer is A) Natural Rights.

The idea of Life, Liberty and the pursuit of happiness is an example of natural rights because in the Declaration of Independence it clearly states that "all men are born with certain unalienable rights, those being life, liberty, and the pursuit of happyness." An unalienable right is one that people are born with and can not be taken away by a government or anyone else. This is the same as natural rights, as these rights belong to people for merely being humans.

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.