Although a number of things brought about world war i, there was one event that pushed europe over the edge. what was that event?
the october russian revolution
invasion of east prussia by russia
assassination of archduke ferdinand
the english naval blockade of germany

The correct answer is C. Assassination of Archduke Ferdinand

Explanation

World War I was an armed conflict that took place in Europe during the early twentieth century in which empires such as Austro-Hungarian, Ottoman, German and Bulgarian were involved, who faced the United Kingdom, France, the Russian Empire, and the United States.

This conflict caused major changes in the political map of Europe and in international relations, especially in Europe. In addition, the event that marked its origin was the murder of the Archduke of Austro-Hungary Franz Ferdinand in Sarajevo because he was the heir of the Austro-Hungary Empire and as he was killed by Gavrilo Princip who was a Serbian the Austro-Hungary Empire declared the war and soon other countries organized in major powers. So, the correct answer is C. Assassination of Archduke Ferdinand

i am not in high school so i don’t know

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.