Answer: The correct answer is B; Manageable of Span Control.
Step-by-step explanation:
The ideal ratio is just 1:5, however this is just the ideal ratio and not a requirement. This is the amount of people that should be under a supervisor during an incident. FEMA has these ideal ratios so when there is an emergency, everything can be controlled without being chaotic and is organized. This helps the manager be effective in managing his/her subordinates.
The other departments within NIMS management are the Modular organization, Management by Objectives, Chain of Command, and Unity of Command.