A. only the functions and positions necessary are filled.
B. functions and positions remain the same throughout the incident regardless of expansion.
C. all functions of the Command and General Staff must be filled.
D. all functions of the Command and General Staff are filled and the entire list of elements within each Section.

Answer-: A. only the functions and positions necessary are filled.

When an incident expands,The correct answer is A. only the functions and positions necessary are filled.

Explanation:

When an incident expands, the ICS organization expands as well to ensure effective management of the incident. This includes filling all functions of the Command and General Staff and the entire list of elements within each Section, as necessary, to manage the incident effectively. The expansion of the ICS organization is based on the needs of the incident, and the positions and functions may change as the incident evolves.

As the incident expands, additional resources may be required to manage the incident effectively, and the ICS organization is expanded accordingly. This ensures that the incident is managed effectively and efficiently and that resources are used appropriately to manage the incident.