Answer:
a. National Convention.
Step-by-step explanation:
The body that instituted many reforms in France, including the prohibition of slavery, the dechristianization of France, and the elimination of the king and queen from decks of playing cards, was the National Convention. The National Convention was a revolutionary government body that existed from 1792 to 1795 during the French Revolution. It played a significant role in shaping the course of the revolution and enacting a wide range of radical reforms.