[A]
It is the result of bargaining by foreign powers as they impose a political system on a territory
[B]
It is the result of a bargain among regional actors and a prospective national government that is driven by external threats
[C]
It is a result of territorial bargaining by elite powers as they develop a national system in a region
[D]
This is a trick question: Riker identifies no such commonality, declaring that “all cases are perfectly unique.”