The answer is C (Enduring)
The Marshall Plan
The "Marshall Plan" was named after the man who then was US Secretary of State, George C. Marshall. Officially the plan was called the European Recovery Program. Marshall announced the plan in 1947, and it went into effect in 1948. The intent was to provide aid and rebuilding to European economies after the damaging effects of World War II. The US intended to build up its allies in Europe and stave off communism.
Answer: There wasn't any.
Explanation:
The Emancipation Proclamation only freed the slaves that were in rebelling states. It didn't free the slaves in the North or effect the border states at all.
The answer you're probably looking for is:
The Stamp Act of 1765 was significant in the sense that it was the first direct tax imposed on American colonists (So, would most likely be the answer that you're looking for to this question, that you have asked