Authors use figurative language to make their writing more interesting and to more easily communicate an idea that is not easily understood because it may have an abstract nature or complexity.
I think the answer to this question is that it paved way to the popularity of mystery fiction. Also, a significant result of Doyle's detective mysteries is their focus on crime investigation and paying attention to details that would help in crime-fighting - which encouraged awareness during his time about it.
Well it isn't D and it has nothing to do with B even thought the Decoration involved and included slavery it isn't the main thing going on there.
Your answer is A
Apprehension is best defined as a feeling of anxiety or fear that something bad will happen.
