What action must Engine 8 take to assist Engine 3 during an operation?

When Engine 8 is called to assist Engine 3 during an operation, deploying hose and charging the line is a critical action that enables effective firefighting. This action directly supports the operational needs of Engine 3 by ensuring that there is an adequate water supply delivered through the hoses to combat the fire effectively.

Charging the line involves pressurizing the hose after it has been deployed, enabling firefighters to access water quickly and efficiently as they engage with firefighting activities. This is essential in emergency situations where every second counts, and a consistent flow of water is necessary to suppress the flames and protect lives and property.

The other actions listed would not be as immediately beneficial in this context. Returning to the base to refill could leave Engine 3 without the necessary support at a critical moment, while focusing solely on rescue operations might divert attention from the ongoing firefighting efforts. Monitoring the water supply from the hydrant, while important, does not actively contribute to the suppression of the fire or assist Engine 3 in a direct and impactful manner during an operation. Thus, deploying and charging a hose is the most appropriate and effective action for Engine 8 to take in this scenario.