The "massacre of st. bartholomew" occurred
a)french prisoners of war were killed by english soldiers
b)revolting peasants were killed by french nobles
c)huguenots were killed by catholics
d)a pope was murdered by the henchman of a french king

The "Massacre of St. Bartholomew" occurred when c) Huguenots were killed by Catholics. This happened in Paris, which was a largely Catholic city in a largely Catholic country, which had big tensions between Catholics and Protestants. The Huguenots, a branch of Protestants, were assassinated and experienced mob violence after a Protestant noble married into the Catholic Medicis noble family. It is thought they were behind the violence.