How often was the sonderkommando replaced?
a. once a yearb. once a monthc. every six monthsd. every four monthse. every week?

wikipedia says "...approximately three months and up to a year or more in some cases..." so i'd go with four months

soviet influence spread across eastern europe sharply during and after wwii. the soviet armies liberated the countries in eastern europe and occupied them from the germans as they were forced to retreat towards germany.