The Answer to the question when an incident expands ________________________________. Is Only the functions and positions necessary are filled.
This question comes with the following multi-option answers.
Only the functions and positions necessary are filled, All functions of the command and general staff must be filed, All functions of the command and general staff are filled and the entire list of elements within each section, functions and positions remain the same throughout the incident regardless of expansion.

What Exactly is Incident Expansion?
An incident may begin modestly and later grow in scope and expand. As the extent of the incident expands and the number of resources required develops, it may be necessary to activate Units, Divisions, Groups, Teams, Branches, or Sections to maintain an adequate span of control. Although one supervisor to five subordinates is the best span of control for incident management, efficient incident management may require alternative ratios.
The ability to delegate resource supervision frees up the Incident Commander to focus on essential decision-making and evaluation tasks. Still, it also clearly outlines the lines of communication to everyone participating in the incident.

When an Incident Expands
When an event grows in size and expands, the incident commander will activate members of the general and command staff to keep the span of control manageable.

Conclusion
Most incidents will escalate without warning, and only the functions and positions necessary are filled at that time. Which is the most efficient thing that can be done in an emergency. This is the answer to the question when an incident expands ________________________________.