How Was FARC Diminished Over Time

How was FARC diminished over time?

A) On April 22, 1997, government antiterrorism experts launched an attack on a residence taken captive by them. Using sophisticated listening devices to track the captor's presence, 140 troops, utilizing five tunnels dug under the residence, surprised and killed all of the captors, with one hostage dying in the attack. They never had as much influence afterwards.
B) The capture of Abimael Guzman on September 12, 1992 along with eight others and his computer that contained their membership roster, organizational structure and weapons caches. Then it was only a matter of tracking them down.
C) FBI director J. Edgar Hoover's aggressive and illegal counterintelligence program, police raids, infighting, and drugs.
D) The President of Columbia aggressively went after them using the support from Plan Columbia.