challenge: Where did a bomb explode on 3 October 1980, during Shabbat services?
  
  A. Rue de Rivoli synagogue in the 1st arrondissement of Paris
  B. Grand Mosque of Paris in the 5th arrondissement of Paris
  C. Rue Copernic synagogue in the 16th arrondissement of Paris
  D. Notre-Dame Cathedral in the 4th arrondissement of Paris
  Answer: 