challenge: What was Wilhelm Zaisser's role in the KPD in the 1920s?
  
  A. He was a low-ranking member with no significant responsibilities
  B. He was the leader of the KPD's propaganda wing
  C. He was a paramilitary instructor and political leader for the KPD in areas such as Rhine, Westphalia, and Berlin
  D. He was the head of the KPD's foreign relations committee
  Answer: 