How could the sequence of events leading to the liberation of Dachau BEST be described?

A.
It took savvy generals to negotiate with the Germans for the prisoner’s release.

B.
Unwilling to surrender, the remaining SS guards and guard dogs fought the advancing soldiers.

C.
A German army detachment was embedded within the camp and ambushed the American liberators.

D.
German civilians created a blockade that attempted to block the access of liberators to the camp.