Which action is part of an emergency response to a reactivity incident?

• A. Cry out loudly to alert others.
• B. Continue the reaction to completion.
• C. Evaluate process data to determine next steps.
• D. Isolate, cool, vent, contain, and respond to incidents to minimize consequences.

Answer: (D)

In an emergency involving a reactivity incident, the priority is to rapidly control the hazard to minimize consequences. The actions that fit this approach are to isolate the reacting system, cool it to reduce the reaction rate, vent to relieve pressure, contain to prevent spread, and respond with appropriate safety measures. This sequence directly addresses the hazard and helps prevent escalation, vessel rupture, or releases.

Alerting others is important for safety, and gathering information can guide the next steps, but none of these replaces the immediate hazard-control actions. Continuing the reaction ignores the danger, and waiting to evaluate data before acting can let the situation worsen.