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What is the advantage of granite over cast iron in making surface plates?

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What is the advantage of granite over cast iron in making surface plates?

(a) Reflects radiant heat

(b) Won’t rust by moisture

(c) Strength for given weight is high

(d) No need of inserts and fasteners

This question was addressed to me in an online quiz.

I'm obligated to ask this question of Tool Maker’s Flats and High Precision Surface Plates in section Linear Measurements of Engineering Metrology

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The correct choice is (b) Won’t rust by moisture

The explanation: Granite absorbs radiant heat which is a disadvantage. Granite won’t rust by moisture but may distort.  Strength of cast iron is more than granite for a given weight.

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