When each firefighter answers to only one supervisor, and this supervisor is the only one in charge, this describes?

The concept being described is unity of command, which emphasizes that each firefighter or subordinate reports directly to one designated supervisor. This structure is crucial in ensuring clear lines of authority and accountability within the organization. When individuals answer to a single supervisor, it minimizes confusion, enhances communication, and ensures that orders and instructions come from one source. This clarity helps prevent conflicts that might arise from conflicting orders coming from multiple superiors, allowing for more efficient operations during emergencies.

In contrast, division of labor refers to the assignment of specific tasks or responsibilities among team members, which can lead to efficiency but does not focus on the reporting structure. The chain of command outlines the hierarchical structure in which authority and responsibilities are defined, but unity of command specifically addresses the relationship each individual has with their direct supervisor, reinforcing the concept of a singular command structure. Team accountability pertains more to the collective responsibility of the group rather than individual reporting lines. Thus, unity of command is the most fitting description for the scenario presented.