Which of the following statements best explains why Russia left World War 1 before it ended?

A The damage of the war caused an internal revolution
B A Russian military-led coup ended the war in eastern Europe
C Germany defeated and advanced into Russia territories
D Tsar Nicholas II ended the war to prevent a revolution

A The damage of the war caused an internal revolution

The statement that best explains why Russia left World War 1 before it ended is option A - The damage of the war caused an internal revolution.

In order to determine the correct answer, let's break down each statement:

Statement A: The damage of the war caused an internal revolution. This is a valid explanation as the First World War took a heavy toll on Russia, leading to widespread discontent and unrest among the population. The war caused severe economic hardships, food shortages, and high casualty rates. These factors eventually led to the Russian Revolution of 1917, which resulted in the overthrow of the Tsarist autocracy and the Bolshevik takeover.

Statement B: A Russian military-led coup ended the war in eastern Europe. This statement is not accurate as there is no historical evidence to suggest a military-led coup by Russians ended the war in eastern Europe. The end of the war was primarily driven by political and military developments involving different countries.

Statement C: Germany defeated and advanced into Russian territories. While it is true that Germany made significant advances into Russian territories during World War 1, this statement does not explain why Russia left the war before it ended. German advancements were a consequence of the war, rather than the cause of Russia's exit.

Statement D: Tsar Nicholas II ended the war to prevent a revolution. This statement is not accurate as Tsar Nicholas II did not end the war voluntarily. It was the revolutionary government that came to power after the Tsar's abdication that eventually signed the Treaty of Brest-Litovsk with Germany in March 1918, formally ending Russia's involvement in World War 1.

Based on the explanations provided, the most accurate answer is A: The damage of the war caused an internal revolution. The Russian Revolution, fueled by the hardships and discontent caused by the war, played a significant role in Russia's withdrawal from World War 1.