Final answer:
The correct answer is A) Contingency plan, which is essential for ensuring the safety of decontamination support personnel during unforeseen events or emergencies.
Step-by-step explanation:
Support personnel who are assisting with decontamination should have a contingency plan for their withdrawal if warranted. The correct response to this statement is A) Contingency plan. A contingency plan is essential to ensure the safety and preparedness of the team in the event of an unexpected situation or emergency. This plan outlines procedures for rapid withdrawal and ensures that steps are in place to protect personnel from potential hazards during decontamination operations.