Answer :
Final answer:
Class K fires (option d), which are typically related to cooking and involve substances like fat, oil, or grease, require an extinguishing agent that uses saponification.
Explanation:
The type of fire that must have an extinguishing agent that uses saponification is Class K. Fires of Class K are typically related to cooking and involve substances like fat, oil, or grease. Saponification refers to the process where fats or oils (triglycerides) are converted into soap and glycerin by reaction with a strong alkaline substance. In fire extinguishing terms, the alkaline substance which is often a potassium compound, reacts to form a soapy foamy substance that acts as a blanket, cutting off the fire's oxygen.
Then answer is option d.
Learn more about Class K fires here:
https://brainly.com/question/31915925
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