The big difference between farmland and industrialised farming is that industrialised farming relies on chemical inputs and a highly mechanised approach, whereas organics is about farming holistically, recognising that we are part of a broader ecosystem. Although, it is important to note that some large-sale organic farms still use industrialised approaches such as mono-crops and some industrialised farms also adhere to organic principles, using limited amounts of chemical inputs.
I have seen both of these used in short stories heck both have been in the same kind of story, as for B and D they both sound like stories that will be more than just a short story.
Explanation: at the time white people were thought to be better then blacks (when really their not) so everybody tried their best to blame the problem at Tom before they even found evidence and such.