Why is it essential to introduce CO2 from a fixed fire extinguishing system, into a large engine room, as quickly as possible?

Correct Answer: Option B — Updraft from the fire tends to carry the CO2 away.

Engine room fires generate intense thermal updrafts that create a chimney effect. If CO2 is not introduced rapidly, these convection currents will carry the extinguishing agent away from the seat of the fire, preventing the necessary concentration from being achieved to effectively displace oxygen and suppress combustion.