Which of the following describes the correct distance between ranks in a formation?

The correct distance between ranks in a formation is 40 inches. This measurement ensures that service members have sufficient space to move and carry out their duties effectively while maintaining proper line formation. The 40 inches allows for appropriate spacing that facilitates clear visibility and communication among ranks during drills and formations. It also considers the operational readiness of personnel and the ability to respond quickly to commands. By adhering to this standard distance, military formations can maintain an organized appearance while ensuring that individuals can perform their responsibilities without crowding or constraining movement.