What is this language... I don't know what this language is, pls use English for your questions next time.
The United States created the Marshall Plan (1947) as a program to "<span>(3) provide economic aid to war-damaged Europe" mostly so that another war would not develop. </span>
I think it is answer A, Common law because it is derived from custom and judicial precedent.
The reason why Great Britain and France declared war on Germany at the beginning of the second World war was because A - The invasion of Poland.
When Germany invaded Poland this was the beginning of what would later be called the second World war. A tense atmosphere was brewing up in Europe for a few years since then already because when Hitler's party took charge of Germany, it increasingly militarized the country and was preparing it for war.
During the cold war, all of us know that America and the Soviet Union were putting the best scientist of there country in the front to develop weapons of mass destruction.
What most don't know is that not only the Russians but the Americans had embedded spies in them to recover weapon specs and also the science between them. In fact, the cold war is known as the golden-age of espionage.