Which systems become unavailable due to a loss of electrical power?

The correct answer highlights that a loss of electrical power directly affects critical systems such as firemain, dewatering, and cooling systems. In naval operations, these systems are often reliant on electrical power to function effectively.

Firemain systems are essential for firefighting onboard; they depend on electrical pumps to deliver water where it’s needed. If electrical power is lost, these pumps typically cannot operate, making the ship vulnerable to fire emergencies.

Dewatering systems, which are vital for removing water that may accumulate in the ship for various reasons, also require electricity to function. Without electrical power, these systems cannot operate, leading to potentially dangerous situations.

Cooling systems, necessary to manage temperature and prevent overheating, likewise depend on electrical power to maintain functionality. A failure in these systems can cause equipment to overheat, leading to damage and operational inefficiency.

Thus, with a complete loss of electrical power, these systems would become inoperable, severely compromising the ship’s safety and operational capabilities. The choice emphasizing the unavailability of these systems accurately reflects the critical dependence on electrical power for their operation.