A Tight Bipolar System Differs from a Looser One in That

A tight bipolar system differs from a looser one in that

A) states have alliances in a tight system, but not in a loose one.
B) states have alliances in a loose system, but not a tight one.
C) a unipolar system always arises from a loose system, but not a tight one.
D) international organizations are likely to be used by states in a tight system, but ineffective in a looser one.
E) international organizations are likely to be ineffective in a tight system, but more likely to be used by states in a looser one.