The answer is D. Isolationism was a period in Americas history when they stayed out of wars and affairs that had nothing to do with itself. Dollar is the american currency, big stick has to do with militarism, good neighbor has to do with helping neighbors and allies.
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A war of attrition.
World War 1 is an example of this.
Traveling across the Pacific Ocean would be the longest distance to travel, since it is the largest ocean by square milage, although it would be possible to combine different routes to increase the distance traveled elsewhere.
It was kind of global. A 19% unemployment in Canada, and in Germany, Japan, and Italy, they started to like the ways of famous dictators in other countries, and in Germany's case, their own depending on who you were.