What Does the Term "Multilateralism" Refer To

What does the term "multilateralism" refer to?

A) The ability of states to work together with private actors and NGOs to promote development.
B) Arrangements among three or more states, commonly for peaceful purposes over extended periods.
C) A last-ditch effort to come to an agreement before engaging in war.
D) A result of when one powerful state coerces others into an agreement to further its own ideologies and interests.
E) None of the above