The statement that best analyzes the challenges Lenin faced in making Russia into the USSR is:
"While Marx had argued that the communist revolution would occur from factory workers, Russia was primarily an empire of farmers."
This statement highlights a fundamental challenge Lenin encountered: the theoretical foundations of Marxism were based on the experiences and conditions of industrialized societies with a significant proletariat, whereas Russia at the time was predominantly agrarian. This disparity made it difficult to implement Marxist ideals effectively, as the social and economic conditions in Russia did not align with those prescribed by Marx’s theories. Lenin had to adapt Marxist principles to fit the realities of Russian society, which posed a significant challenge to the establishment of a communist state.