D.To reduce the negative effects of economic collectivization
The New Economic Policy was a roll back on socialist policy to protect the collective policies.
Centralizing the economy was beginning to impact the USSR economy negatively. To protect the power of the party and the progress already made, Lenin allowed for some capitalistic policies to vitalize the economy. Agriculture and small business were returned to private ownership while larger industries remained collectivized.
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Probably your best bet is "<span>the removal of Bosnian Serbs from political power"</span>
D: The conquests brought great power and wealth to the Romans.