D. both specify responses to no recurring situations
Answer: D. its ability to resist being scratched by other substances.
Explanation
The degree of hardness in the mineral can be determined by the difficulty of minerals scratching each other or the use of a tool that can penetrate.minerals are very unique which makes it hard to scratch then,the process of scratching is not an easy one because it involves the ability of the mineral to break the bonds that are within it.
The answer is<span> A) William McAdoo.</span>
