Oil is to blame for... global instability?

So, ascribing to a realist theory of international relations, what happens when Royal Dutch Shell finally decides they've had enough of these Nigerian rebel groups destroying their energy infrastructure? When energy prices become untenable?
A.) Small wars to secure resources
B.) Neo-colonialism
C.) Collapse of international institutions
D.) All of the above?

Constructivism is all well and good when resources are abundant, but don't tell me that a starving nation would prefer to perish nobly adhering to the international norms.