What allows the JFC to ensure the priority of the air effort is consistent with campaign or operation phases and objectives?

The correct choice is air apportionment because it refers to the process by which the Joint Force Commander (JFC) allocates the total air effort among the various components of the joint force. This fundamental activity helps ensure that air operations align with the objectives laid out in the overall campaign or operation plan. Air apportionment determines how much of the air power will be assigned to each component and phase of the operation, thus enabling the JFC to prioritize resources effectively and ensure that the air effort is appropriately synchronized with ground and naval operations.

By incorporating these priorities into the air effort, the JFC can maximize the effectiveness of air power in achieving mission goals across different operational phases. This process is crucial for maintaining a coherent strategy, as it enables the proper distribution of air resources in alignment with the changing demands and objectives throughout different phases of a campaign or operation.