How was the Medellin Cartel finally brought down?

A.
Its leaders were arrested and imprisoned in American jails.
B.
Its leaders were hunted down and killed by armed forces.
C.
The cartel ended its activities in exchange for immunity.
D.
Small, independent producers took over its territory.

Please select the best answer from the choices provided.

The best answer is A. Its leaders were arrested and imprisoned in American jails.