Amaterial that is not easily scratched is tough strong hard elastic

In science, hardness refers to the measure of how easily a material can be scratched or indented. Given your choices, we can conclude that a material that is not easily scratched is HARD.

Elastic is definitely out of the question because it refers to how much you can stretch a material without it breaking. Toughness refers to how much energy a material can absorb without deforming or cracking. When you refer to strength of material, you measure how much load you can apply on it without it deforming or breaking. 

Ipersonally think that it is d