The factor which is most important to keep the same when comparing the hardness of the solid is the method of making the scratch on the material. therefore the correct option is A.
What is the matter?
Anything which has mass to keep the same when comparing the hardness of the solid and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.
These different states of matter have different characteristics according to which they vary their volume and shape.
The hardness of any substance is defined as its ability to resist the indentation to scratch the surface of the material. there are a number of different tests performed for judging the hardness of any material, before performing the hardness test the surface of the material must be prepared well
While comparing the hardness of the solid is the method of making the scratch on the material. therefore the correct option is A.
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