When fighting a fire in a space containing an IMO class 1 hazardous cargo, the most effective fire fighting procedure is to __________.

Correct Answer: Option A — use water from fire hoses or a sprinkler system

IMO Class 1 hazardous materials consist of explosives, which contain their own oxidizers. Standard smothering agents like CO2 are ineffective; massive volumes of water from fire hoses or sprinkler systems are required for cooling and suppression.