Answer:
b) people invaded the royal palace
Explanation:
The french revolution turned radical when people invaded the king's palace. Prior to this the bastille was stormed as people took to arms.
A group of insurgents whose leader was Jacobin attacked the king's palace and arrested the king on August 10, 1793. He was later condemned to death and killed on the guillotine.
After King Louis xvi was executed, there was war with different european powers and also great division in the national convention. This led the french revolution into a very violent and troublesome stage. There was the reign of terror where a lot of people were guillotined.