Conceptualizing International Relations as a "System" Suggests That

Conceptualizing international relations as a "system" suggests that

A) actors involved in international relations interact with each other in regularized ways.
B) states and other relevant actors are automatons that lack the capacity to change.
C) there are no regular patterns to international affairs.
D) international politics is very similar to cell systems.
E) you can only study the whole of international politics at once and not focus on individual actions.