One thing my professor suggested was to make a draft of your thesis (you can always edit it later) and start on the body paragraphs. Do the conclusion and intro paragraphs afterward.
Answer: 2 “Some cities with very cold winters have skyways”
Explanation:
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.