One Reason Regime Change as a Means of Stopping Terrorism

One reason regime change as a means of stopping terrorism might NOT work is because:

A) such actions often produce new regimes that are more conducive to violence.
B) the costs outweigh the benefits of lives saved.
C) the United Nations will not permit it.
D) terrorism operates outside of regimes.
E) regimes can, in fact, never be changed.