The answer is C: they treat him cruelly.
Hope this helps!
Answer: D it connected farms in the west to the ports in the east improving trade
Explanation: I took the test
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.
