Sentence fragments are incomplete sentences that were disconnected from the main clause by a period. There is a way to connect them back and is by changing the period with another punctuation as a comma.
The option above is a clear sentence fragment because there is a lack of context about what was happening by the time the dogs were enjoying their bones.
We have no information about the characters OR what is going on around them. To fix this, either take a screenshot of the story you asked this question about, OR copy and paste the article to this.
Indeed, diamond is the hardest material in the world. Material hardness is a property determined by scratch resistance.
Explanation:
A substance can only be scratched by something of equal or greater hardness. Therefore, only a diamond can scratch another diamond. Hope this helps! :)
