Answer:
C
Step-by-step explanation:
The Reign of Terror started 17th September 1793, by then both the King and Queen had been judged, convicted and executed by the National Convention. First the King, who was killed in January of that year, and then the Queen, who was judged and executed late in August.
While the King's trial was conducted with the appearance of legitimacy, the Queen was judged and sentenced without too many arguments.