Which statement describes the necessity of american intervention in world war ii that benefited the soviet union? a. the onset of winter in russia would decrease soviet military production and lead to an onslaught by the nazi army. b. the soviet union needed the united states to provide air support during the german attack on st. petersburg. c. the soviet union needed american military supplies to thwart the oncoming german blitzkrieg. d. the soviet union required british and american intervention in the european theater due to the german invasion.