Nazi Soldiers Along Soviet Lines Were Unprepared for the Onset

Nazi soldiers along Soviet lines were unprepared for the onset of Russian winter because

A) Germany lacked the resources by that point in the war
B) Hitler feared that equipping his army for Russian conditions would suggest to civilians that a long war lay in store
C) Hitler was overconfident about the speed with which his armies would conquer Russia
D) German scientists predicted a mild winter that year