Which part of the inert gas system is designed to relieve sudden large overpressures that exceed the capacity of the mechanical P/V valves?

Correct Answer: Option B — Liquid filled P/V breaker

The liquid-filled pressure-vacuum (P/V) breaker acts as a safety device of last resort. It is designed to relieve sudden, massive pressure or vacuum surges that exceed the flow capacity of standard mechanical P/V valves, protecting the cargo tanks from structural failure.