Question

the french revolution grew more violent mainly because radicals reacted to
the national assembly falling apart.
prices rising to an all time high.
rums of foreign intervention to end the revolution.
prisoners running rampant after release.

Explanation:

Radical factions in the French Revolution escalated violence in response to widespread fears that foreign monarchies would invade France to crush the revolution and restore the monarchy. This paranoia drove extreme measures like the Reign of Terror.

Answer:

rumors of foreign intervention to end the revolution.