The Great Wall of China is the longest building on earth with a length of 13,170 miles. Made from a combination of brick, stone, wood and other materials, it was originally constructed primarily to serve as a defence against the nomadic invasions from the north that threatened Chinese states / empires.
There are several ways in which a reader can determine the theme of a piece of literature, but the best way is to pay close attention to the very opening lines, where the theme is usually set up.
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The correct answer here would be Vladimir Lenin, leader of the Bolshevik Revolution that brought communism to power in Russia and established the Soviet Union. Lenin's "New Economic Policy" serves as an example of central planning to bring everything under the central government's control.
Karl Marx and Friedrich Engels were the philosophical founders of communist ideas back in the 19th century.
Josef Stalin was the totalitarian leader that took over the communist leadership in the USSR after Lenin's death.
The answer to this question is B