challenge: What event was commemorated by the Hungarian Boy Monument in Szczecin and Csepel?
  
  A. The 30th anniversary of the establishment of diplomatic relations between Hungary and Poland
  B. The 40th anniversary of the fall of communism in Hungary
  C. The 60th anniversary of the Hungarian Revolution of 1956
  D. The 50th anniversary of the end of World War II
  Answer: 