Which of the following was a major cause of the Russian Revolution ofFebruary-March 1917?

This option is incorrect because the Red Army, led by Lenin, was not a significant factor in the February-March 1917 Revolution. The Red Army became prominent later during the Russian Civil War. At the time of the revolution, it was primarily the dissatisfaction of the general populace that drove the change, not a successful military insurgency.

While military morale and the perception of the war's unwinnability were factors, this choice does not directly address the widespread civil discontent that led to the revolution. The revolution was primarily rooted in the social and economic struggles faced by ordinary citizens, rather than solely in military strategy or decisions.

This statement is inaccurate as there was no such decree regarding the reestablishment of serfdom prior to the revolution. In fact, serfdom had been abolished in the 19th century. Thus, this choice misrepresents the historical context and overlooks the real grievances related to wartime hardships and ineffective leadership.