The answer is Pessimistic Explanatory Style.
Pessimists have the opposite explanatory style for they blame themselves for things with bad luck that happens and thinks that the cause was something permanent. But, when something good happens, they tend to connect and depend it to luck and see the cause as a temporary case only.
Answer:
A) To protect the Soviet Union from an invasion by the US and its allies
Explanation:
The Berlin Wall was built by the German Democratic Republic during the Cold War to prevent its population from escaping Soviet-controlled East Berlin to West Berlin, which was controlled by the major Western Allies.
I Belive the answer is B., to New York City.
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B) Expanding interstate commerce nationwide, and reaching the west beyond the Mississippi River. Railroads connected cities in the eastern United States with western territories increasing interest in investment.