Final answer:
The main difference between modern and classic detective stories is the shift from professional d. detectives to amateur sleuths in contemporary narratives.
Step-by-step explanation:
One major difference between modern detective stories and classic detective stories is that d. modern detective stories often feature amateur detectives rather than professionals.
This is in contrast to the classic detective genre, which typically features a professional detective who uses logical reasoning and deductive skills to solve a crime.
Classic detective narratives, exemplified by the work of Sir Arthur Conan Doyle and Agatha Christie, often revolved around a brilliant detective figure, such as Sherlock Holmes or Hercule Poirot, respectively.
In contemporary detective stories, the protagonists may include journalists, hobbyists, or even criminals themselves, leveraging more on relatable characters who solve mysteries by happenstance or personal motivation rather than formal training.