Read this excerpt from an article titled "dangerous ideas": in most cases, books are challenged or banned because they introduce ideas or topics some people would prefer not to examine, or address issues that some find difficult to think and talk about. for example, many people object to books they consider to be obscene because they oppose the use of swear words and vulgar language in the book, or because ideas expressed in the book about race, gender, social class, religion, or drugs don't align with their values. what is the author's purpose in this excerpt?

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.

the first question's answer is a.