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Which of the following factors do not affect the critical cooling rate?

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Which of the following factors do not affect the critical cooling rate?

(a) Chemical composition

(b) Hardening temperature

(c) Number or nature of grains

(d) Purity of steel

This question was addressed to me in a job interview.

My question is from Transformation Diagrams topic in portion Heat Treatment of Engineering Material & Metallurgy

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Right choice is (c) Number or nature of grains

Explanation: The slowest rate of cooling of austenite that results in 100% martensite transformation is called a critical cooling rate. This depends on the chemical composition, hardening temperature, and metallurgical nature (purity) of steel.

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