Answer:
The KKK's organizational structure has MOST likely influenced its ability to survive as an active extremist group by making it easier for the group to withstand challenges. The KKK has a hierarchical structure with a centralized leadership that has enabled the group to withstand crackdowns by law enforcement and continue its activities in secret. The group's leadership structure has also made it easier to maintain secrecy, discipline, and loyalty among its members. Therefore, option (a) is the correct answer.