They traded with them selves.
Their civilization has never paused, or changed. They still have their old cultures (sort of) They still have the same language.
You could, dig a 6ft hole. put the body down cover it then kill an animal or a bird then put that on top of the buried body and cover it with dirt then boom if a dog comes with that sniffer they’ll find the bird but not the body, you also have to take clothes shoes anything in blood and clean then discard it
I believe that the answer is (B) the consumer appeal. I hope this helps. Have a nice day:)