Which of the following is necessary for a state to terminate its membership in the compact?

The correct answer is based on the framework established by the Interstate Compact that governs agreements between states. For a state to terminate its membership in the compact, it typically requires majority approval. This ensures that the decision reflects a collective consensus among the member states involved without necessitating an overwhelming agreement that could hinder the practicality of the compact.

In this context, other options, like a unanimous vote from all states, would be too demanding and impractical, as it is unlikely that every state would agree to a termination at the same time. Similarly, a two-thirds majority vote in Congress is not relevant here, as interstate compacts do not require congressional vote for individual state exits. Also, while a proposal from the state legislator may initiate the process, it does not in itself constitute the necessary action to terminate membership in the compact. Thus, majority approval is the standard mechanism that strikes a balance between efficiency and collaboration among states involved in the compact.