Final answer:
According to liberal theory, states A and B would agree to agreement 2, where state A gains $5 and state B gains $7.
Step-by-step explanation:
According to liberal theory, states A and B would agree to agreement 2, where state A gains $5 and state B gains $7. Liberalism in international relations focuses on states working together to achieve collective security and mutual benefits. In this scenario, agreement 2 offers a higher level of mutual gain compared to agreement 1, making it more likely to be accepted by both states.