Which term best describes the relationship of authority within military command?

The term that best describes the relationship of authority within military command is unity of command. This concept emphasizes that each subordinate should be directed by a single superior, establishing a clear line of authority and accountability. Unity of command ensures that orders and directives come from one leader rather than multiple sources, which enhances operational efficiency and reduces confusion, especially in complex military operations. This principle is fundamental in maintaining discipline and coherence in the armed forces, as it helps ensure that all personnel understand their roles and responsibilities clearly and reduces the chance of conflicting orders.

In contrast, the other options either pertain to different aspects of organizational structure or management principles that do not specifically define the direct relationship of authority within military command. For instance, decentralization refers to the distribution of decision-making closer to the point of action, which can complicate command relationships. Delegation of power involves assigning authority to subordinates but does not establish the direct lines of authority as clearly as unity of command. Command responsibility relates to the accountability of leaders for their actions and decisions, which is important but does not describe the structural relationship of authority.