Answer:
The fourth alternative 
Explanation:
In both passages the 2 young lovers are forced apart because of their families.
 
        
             
        
        
        
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.