The Provision of International Public Goods,such as Collective Security,tend to Be

The provision of international public goods,such as collective security,tend to be most effective when there:

A) is a large group of states that would all benefit from it.
B) is an international institution devoted to the provision of that good.
C) is a powerful state that is willing to pay the costs in providing the public good.
D) is large enough costs to war to make bargaining possible.
E) does not exist a real rival to challenge the existence of the public good.