Reasons for why the communism came to Russia in 1917?

Overthrown to due injustice

Explanation:

Corruption and inefficiency were widespread in the imperial government, and ethnic minorities were eager to escape Russian domination. Peasants, workers, and soldiers finally rose up after the enormous and largely pointless slaughter of World War I destroyed Russia’s economy as well as its prestige as a European power.

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the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."