For three years, the king and queen were held prisoner in their palace in paris. why were they eventually executed
a. the storming of bastille lead the people of france to demand the monarch’s execution.
b. the king and queen were killed during the reign of terror, when riots killed thousands of french citizens.
c. the national convention convicted the monarchies of conspiracy and sentenced them to death.
d. the king's open opposition to the revolution doomed him and his family.

C

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.

Option: C.The National Convention convicted the monarchies of conspiracy and sentenced them to death.

Explanation:

The National convention was responsible for sending monarchies to the guillotine after declaring them being conspiracy with foreign powers. Louis XVI's policies and lack in response to the financial situation in the empire led to the rise of the French Revolution. Louis guillotined in 1793, followed by Marie Antoinette, his wife after nine months.