How can alliances in the balance-of-power (multipolar) system be characterized?

Question

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In a multipolar balance-of-power system, alliances are usually formed based on advantage rather than ideology. States seek allies that can provide military or economic support to counterbalance the power of rival states. These alliances are often temporary and pragmatic rather than long-lasting. Additionally, there are often multiple alliances that overlap and shift as the balance of power changes. Therefore, B is the best choice.

How Can Alliances in the Balance-Of-Power (Multipolar) System Be Characterized