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Which of the following is regarded as a modern abrasive?

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Which of the following is regarded as a modern abrasive?

(a) Tripoli

(b) Silicon carbide

(c) Pumica

(d) Boron carbide

I had been asked this question by my school teacher while I was bunking the class.

Asked question is from Abrasives, Silicate Structures and Polymorphism topic in chapter Composite & Ceramic Materials of Engineering Material & Metallurgy

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Correct option is (d) Boron carbide

The explanation is: Boron carbide and tungsten carbide are generally regarded as modern abrasives. They are close to the hardness of a diamond, which is a natural abrasive. Boron carbide is used for polishing pastes.

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