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How does the rate of cooling affect the hardness of steel?

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How does the rate of cooling affect the hardness of steel?

(a) Faster cooling results in low hardness

(b) Slow cooling results in high hardness

(c) Fast cooling results in high hardness

(d) No change is found

I have been asked this question in homework.

Question is from Hardening and Hardenability in division Heat Treatment of Engineering Material & Metallurgy

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Correct option is (c) Fast cooling results in high hardness

Explanation: We know that hardness depends on the nature and properties of the quenching medium. It was found that faster cooling resulted in greater hardness of the steel, and slow cooling lowers the hardness.

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