The Longevity of the Thugees Is Due Mostly to

The longevity of the Thugees is due mostly to

A) their targets, travelers, undertook long journeys through dangerous territories where death may come by natural causes or common robbers and no one would be able to know anything of it.
B) their large arsenal of weapons and their support base among citizens.
C) their random strike pattern that no one could predict.
D) their strong, centralized leadership that stayed alive for generations.